Wonderweiss Margera is an arrancar serving under Sōsuke Aizen, though he never achieved Espada status. Despite this, Soul Society has assessed his spiritual power to be on par with the Espadas themselves. He's small and thin with an almost childlike appearance, and what remains of his hollow mask sits atop his head like a tiara or crown.
His personality matches his looks—genuinely childlike, possibly autistic in nature. He gets distracted easily and doesn't take orders seriously; when tasked with killing, he'd rather play with dragonflies. He can be hostile in the moment, firing off bala blasts without warning, but just as quickly reverts to his innocent demeanor. His speech is severely limited, rarely managing more than a few syllables at a time.
Wonderweiss seems drawn to Kaname Tōsen, whom he views as a "pure being" in some spiritual sense (though Tōsen himself admits he's not sure if that purity is good or evil). This affinity causes Wonderweiss to follow Tōsen around whenever possible, and he's protective enough to try blocking Gin Ichimaru from getting too close, wary of the other man's intentions.
His zanpakutō is a massive purple blade strapped to his back, roughly his own height. The hilt has a distinctly Western longsword feel rather than a katana, complete with traditional woven wrapping, and the guard is shaped like an Egyptian eye. His zanpakutō's name and release form have never been disclosed.
Content compiled by AnimeList.moe from publicly available sources.
