Lucia Raregroove is Gale Raregroove's and Emilia Raregroove's son, and heir to the Raregroove kingdom. He is the second main antagonist of the series, after King's defeat at the hands of the Rave Warriors.
At a very young age, Lucia met his father's best friend, Gale Glory, who tried to prevent Demon Card from using the Dark Brings' power. That, however, resulted in a tragic accident. When Gale Glory left the Demon Card building, Slade, the man who Gale Glory told everything to, assaulted Lucia's family, killing his mother and many of the Demon Card members. It was then believed that Lucia was killed along with his mother. However, it was later revealed that he survived the assault and was taken prisoner at the MegaUnit, where he lived for most of his life. At one point in his life he gained a scar and also found the mother Dark Bring, Sinclair. He lived in solitude his whole life, as he said to his sworn enemy, Haru Glory.
And he is reprised by Armando Valdes Kennedy in the English dub and Soichiro Hoshi in the Japanese dub.