Lucas is the son of Flint and Hinawa, and the twin brother of Claus. He lives in Tazmily Village with his family and dog Boney. Lucas has blonde hair, black eyes, a yellow t-shirt with red stripes, blue shorts, white socks and red sneakers. He learns his PSI powers from Ionia, one of the seven Magypsy. Until he embarked on his adventure, Lucas had a reputation of being a Crybaby even prior to the numerous crises that changed his family.

Lucas is shown to be timid, gentle, and cautious. Almost the opposite of his twin brother, Claus. He can show determination, but only when the situation permits. Three years after his mother's death, Lucas has matured to becoming a boy much like his brother Claus, determined and strong-willing. He sets out to find the missing thief Duster and later pull the Seven Needles.

Lucas is your main Assist PSI user, because he learns all versions of Lifeup, while Kumatora only goes up to Beta. He also learns all version of Healing, while Kumatora only learns Alpha. He also has Refresh, which restores about 30 HP each turn. His main attack is PK Love, which does anywhere from 100 to 800 damage, depending on what level of power is used. He also learns Shield, Counter, PSI Shield, PSI Counter, OffenseUp, and Defense Up. In Chapter 5, he also learns PK Flash.