Aichi Sendou (Stand Up, the LRIG!)

Aichi Sendou is the main protagonist of the majority of the Cardfight!! Vanguard anime and one of the main characters for Stand Up, the LRIG!. Despite not taking up the lead role in the fic (much like in Legion-Mate), he still plays a major part in the story once he rejoins Kai during the second arc and continues to assist his friends, old and new, in their efforts to end the Selector Battles and Chaos Breaker's plans for the world that they take place in.

He also comes into the possession of Umr, one of the two LRIGs that were originally part of a being known as Ut'ulls that Mayu and Miyako once attempted to revive using several girls as 'vessel candidates' six years prior to the events of the story. He also plays a mentor like role to Hitoe Uemura, helping her overcome her nervousness over time and improving in her confidence using everything he's learned on his journey up to this point.