Mikuni
He's one of the four Temple guardians, a role that comes with serious responsibility in the dueling world.
Mikuni's strategy during his match against Shobu was pretty clever—he straight-up mirrored every move Shobu made, basically using the guy's own playstyle against him to mess with his head. It worked as a psychological tactic.
Like the other guardians, Mikuni genuinely cares about Hakuoh's wellbeing. He and the group want to see Hakuoh return to being the relaxed, content player he used to be—someone who could duel with a clear, peaceful mind. More broadly, Mikuni believes everyone should just chill out and remember what makes dueling fun in the first place.
Content compiled by AnimeList.moe from publicly available sources.