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Lucas is a timid and shy boy from Tazmily Village, living there for his entire life. He is close with his family, primarily, although he does know the other villagers fairly well. He also loves his dog, Boney, and goes out playing and taking walks with him often.
In the game's prologue, Lucas is visiting his grandfather, Alec, with his family. He enjoyed the visit a lot, often playing outside in the fresh mountain air with his twin brother and the Dragos. However, in the next chapter, he and his family get lost in the burning Sunshine Forest, and his mother ends up getting attacked and killed by a reconstructed Drago. Lucas and Claus's lives were spared, instead getting pushed into the river and later washing up on the shore and being found by some of the villagers. However, their behavior changed quite a bit with this incident; Lucas became even more shut-in and crying a lot more than usual, while Claus went to avenge his mother and took a knife to slay the Drago. Claus was unsuccessful, however, and ended up getting severely injured and lost in the mountains. Lucas's father, Flint, was struck very hard by both of these tragedies and ended up neglecting Lucas altogether, constantly mourning Hinawa at her grave and searching for Claus in the mountains.
Near the end of Chapter 3, Lucas comes in at a critical moment with Kumatora, Salsa and Wess surrounded by Pigmask tanks, calling upon a Drago to smash the tanks and save them from being captured or even killed. He then learns of the current situation, with the Pigmasks slowly taking over Tazmily Village and was urged by Wess to stay in Tazmily to protect the village with his father. He followed his advice to stay in the village, however, it was too late to prevent damage being done to the town. Tazmily Village then started urbanizing, townspeople became greedy and Chimeras were released out in the wild, radically changing the once simple and trusting town.
In Chapter 4, Lucas sets out with his dog to investigate the mysterious bassist, who is apparently an amnesiac Duster, at Club Titiboo. On the way there, he met a Magypsy named Ionia, who taught him psychic powers. He then encounters Kumatora at the club, seeing her for the first time in three years. She discusses the various things that have happened over the past three years, and they both come to the conclusion that they need to become stronger and try to stop the Pigmask Army. They both also get Duster to come along with them on their journey, and also search for the lost Egg of Light.
Later, in Chapter 5, Lucas is repeatedly mistaken for the Pigmask Army's commander, the Masked Man. This gave him the advantage of being able to invade Thunder Tower to take down the generator causing the lightning strikes to the village. However, destroying the generator also resulted in the destruction of the tower, and while him and his friends clung to a nearby aircraft that was originally brought there for Fassad's safety, they couldn't hold on well enough and all fell in different locations on the island, being separated once again.
Lucas and Boney found themselves on a large plateau of sunflowers, reminding Lucas of his mother. After walking around the field, he then saw what appeared to be the ghost of Hinawa, and followed her off of the cliff, landing conveniently in a haystack. While walking around the town, he runs into Ionia once again, who is stuck and tied up. Lucas leads Ionia back to Aeolia's house, and learns of the Seven Needles and his special ability to pull the Needles. He then sets out to fufill this quest, with Aeolia's Needle in Osohe Castle been already been pulled by the Masked Man. Before he leaves on his quest, however, Flint indirectly gives him his prized Courage Badge, as a good luck charm.
Throughout his adventure to pull the Needles and bring peace to the world, Lucas visits many areas he hadn't before. On his way to pull the second Needle, he visits the Chimera Laboratory and learns more about the Chimeras, meets Dr. Andonuts and briefly reunites with Salsa. Salsa assists him with opening the door to the second Needle, only unlockable by a special dance. Lucas also finds Kumatora there, being taken in by Doria after she fell into the pond nearby Doria's house. Lucas then is able to pull the second Needle, and obtains PK Love β.
The three of them then travel through a large mole cricket hole, leading to Snowcap Mountain, and coincidentally the third Needle location. Going up the mountain, they find Lydia's house, and Lydia agrees to open the door leading to the Needle. However, it is too late, and the Masked Man has already pulled it. After Lydia disappears, Lucas and his friends leave the mountain by riding a refrigerator down it. They land in Sunset Cemetery, and then head for the fourth Needle located at Fire Mountain. On the way there, they reach Saturn Valley, and also reunite with Duster there. The Mr. Saturns help them with climbing up the cliff to the volcano, and Lucas soon meets Phrygia in his house. He then goes to pull the fourth Needle deep in the volcano, and is almost stopped by Fassad. However, Lucas and his party take him down, and he is able to successfully pull the fourth Needle and learn PK Love γ. Before Lucas leaves, a Mr. Saturn offers to take his Courage Badge and polish it up, promising that it has some special power underneath all of the rust and dirt.
Lucas eventually finds the fifth Needle located at Tanetane Island, but on his way to Mixolydia's house, everyone is very low on energy and are forced to eat dangerous mushrooms to recover. The mushrooms cause frightening hallucinations, causing the consumer to see illusions of their worst fears. Lucas is tormented by illusions shunning him, along with ones of Flint shouting at him and Claus being eerily innocent. However, when they reach Mixolydia's house, they manage to recover, and Mixolydia opens the gates to the fifth Needle. Lucas defeats the Barrier Trio guarding the Needle, however, right before he pulls it, the Masked Man flies down from below and strikes the team with lightning, knocking everyone out. When Lucas wakes up, the Needle has been already pulled, and they head back to Tazmily Village.
The sixth Needle is located by Ionia's house, at Argilla Pass in the northern mountains. On the way to Ionia's house, Lucas meets the Mr. Saturn that was cleaning his old Courage Badge, and discovers that it was really an old Franklin Badge. Shortly afterwards, he meets with Ionia, and Ionia agrees to give him the Waters of Time needed to open the temple holding the sixth Needle. However, right outside of the temple. the Masked Man is there accompanied by Pigmasks, and they fight over the Needle. The Masked Man attempts to take them down in one hit with lightning, however, the Franklin Badge Lucas received earlier reflects the lightning back to him, giving Lucas the upper hand in combat. They finally manage to take him down and Lucas successfully pulls the sixth Needle, learning PK Love Ω in the process.
Shortly afterwards, he is invited to move to New Pork City by the request of the Pig King. Lucas is forced to come to the city, and he finds that most of Tazmily villagers have moved to New Pork City. During his stay in the city, he learns of the shocking history behind the Nowhere Islands and Tazmily Village from Leder, and invades the Empire Pork Building, the Pigmask Army's main headquarters, in hopes of taking them down once and for all. Lucas meets the Pig King, Porky, at the very top of the building, however, before they may fight, they're sent down a long elevator, leading to a cavern deep under the city. The seventh Needle happens to be located here, and after a long fight with Porky, Lucas is finally close to reaching the seventh and final Needle.
Flint is on the ground on the path to the final Needle, without his hat. He states to Lucas that he's positive that the Masked Man's true identity is Claus, and Lucas finds himself unable to fight him knowing this fact. He presses onwards anyway, and finds the Masked Man standing near the final Needle. The Masked Man attacks Lucas with a bolt of lightning, only to be deflected back at him. However, the lightning seems to have only been deflected for Lucas, as everyone else around him has fallen unconscious. They are then locked in combat, with Lucas lacking the will to attack his long-lost brother, while the Masked Man fails to recognize Lucas and simply continues attacking him. Many times throughout the battle, Hinawa's voice calls out to the boys, and after many long turns, Claus finally comes to his senses and stops attacking Lucas. Claus then electrocutes himself and slowly dies, struggling to walk over to Lucas to give him one last embrace. He says to Lucas that he's "going to where mom is now", and apologizes for being hasty and all of the troubles everyone has gone through. He passes away in Lucas's arms, and he is left to pull the final Needle and recreate the world, filling it with peace.
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Super Smash Bros. Brawl
Lucas appears as a playable fighter in Brawl. He is a default character unlike Ness. Lucas and Ness both have PK Fire, PK Thunder, and PSI Magnet in their movesets, however they are vastly different. Lucas's PK Fire hits once instead of multi-hits, PK Thunder multi-hits opponents and travels farther than Ness, and PSI Magnet is in front of Lucas but has a hurtbox upon release. Lucas's side smash is also very similar to Ness, and PK Freeze behaves similarly to PK Flash. Lucas and Ness share a Final Smash, PK Starstorm. Aside from this, Ness and Lucas's movesets are entirely different. Lucas uses Duster's Rope Snake as his grab, giving him a long range grab. It can also be used as a tether recovery.
The Subspace Emissary
In the Subspace Emissary, Lucas is shown as a weak, shy and timid figure, almost identically to how he appeared in the beginning of Mother 3. Lucas first appears alone in The Ruined Zoo, and is attacked by The Pig King Statue, which chases him throughout The Ruined Zoo. He trips over a branch and gets stuck, but Ness arrives to save him from the giant Pig King Statue, which is soon revealed to be Porky Minch. Lucas and Ness team up to defeat Porky. After the two defeat Porky, Wario arrives with his strange cannon and attempts to hit Ness with it. Ness dodges his attacks, so Wario tries to attack Lucas instead. Lucas doesn't move out of the way, so Ness ends up taking the hit himself. Lucas, scared, runs away and escapes Wario.
Later, he meets the Pokémon Trainer, and they join to fight the Subspace Army, as Lucas cannot forget what Wario had done to Ness. Outside the Ruins, the Pokémon Trainer decides to capture a Charizard that flew by. Before entering them, however, they are ambushed by Wario. They defeat him, but Lucas becomes disappointed that Wario doesn't have Ness with him anymore. After capturing Charizard and an Ivysaur inside the Ruins, Lucas and the Pokémon Trainer reach the Ruined Hall, where they are attacked by Galleom (Who falls from the roof after he was previously defeated by Meta Knight, Marth, and Ike). After defeating him, Galleom takes them and starts flying into the air, with a Subspace Bomb in his head about to go off. Lucas frees himself and the Pokémon Trainer, and they are then saved by Meta Knight, whose team they then join.
At The Glacial Peak, Meta Knight leaves them to get his ship, the Halberd, back. They are then joined by the Ice Climbers as the Subspace Army is sent out to attack them. Mario, Link, Yoshi, Kirby and Pit then appear to assit them and defeated the enemies. Soon, the other remaining heroes show up and they enter Subspace together. Unfortunately, Lucas and the others were defeated by Tabuu's Off Waves attack. Lucas is saved by King Dedede, who had revived Ness and Luigi with badges. After clearing The Great Maze, the characters reaches Tabuu again. He attempts to use his Off Waves attack, but they are destroyed by Sonic. Lucas, along with the other revived characters team up to defeat Tabuu, the ruler of Subspace.
Lucas does not appear in the initial release of Super Smash Bros. for 3DS/Wii U. It was later revealed in the Nintendo Direct broadcast on April 1, 2015 that Lucas would be featured as a downloadable character in Super Smash Bros. for Nintendo 3DS and Wii U. He was released on June 14, 2015. He retains his special moves and Final Smash from Brawl.
Super Smash Bros. Ultimate
Lucas, along with Ness, is set to return in Super Smash Bros. Ultimate.
The younger of twin brothers living in Tazumili Village in the Nowhere Islands. He's a kind boy who can communicate with animals, but he's shy and never really got over the tragedy that struck his mother. He fights a warped dictatorship, hunts the Seven Needles, and crosses swords with his missing brother, Claus. In the end, the young boy with psychic PSI powers grows up.
Final Smash (PK Starstorm)
Lucas's Final Smash. He pulls a large group of stars from the sky and sends them smashing down among his enemies, causing damage to one and all. In Mother 3, this move was used by Lucas's traveling companion, Princess Kumatora. As Ness learned this move from Poo, Princess Kumatora taught Lucas when he learned he would appear in Super Smash Bros. Brawl.
Super Smash Bros. for Nintendo 3DS and Wii U (Trophy)
Before adventuring, Lucas was a timid, cautious boy. His journey has made him a stronger person. Maybe he met someone to spend his life with... Hang on—we're moving way too fast! For now, remember that Lucas and Ness are favorites in the hearts of EarthBound fans."
Regular (available as DLC)
The younger of the twin brothers from Nowhere makes his triumphant return to the game of Smash. Hailing from the Japan-only game Mother 3, Lucas's specialty is psychic projectile attacks. He can use these PSI attacks to do things like absorb enemy projectiles and deal supernatural damage!
Alt (available as DLC)
Lucas's up special PK Thunder can hit enemies multiple times, but if you hit yourself with it, you can then tackle and launch opponents! Lucas's up smash has the strongest launch power of any fighter's up smash. The range for this attack is wide, and it's strongest right after Lucas unleashes the attack.
Final Smash (available as DLC)
You can adjust the direction of the stars in this attack! Rain stars down on multiple fighters, or be mean and pick on a single fighter. The choice is yours! If a star connects, it will deal ongoing fire damage, making it hard for opponents to return to the stage.
Note: This trophy only appears in the Wii U version.
Super Smash Bros. Ultimate
Lucas, alongside Ness, returned as playable characters in Super Smash Bros. Ultimate, released on December 7, 2018. Lucas, unlike Ness is not available from the start and must be unlocked.