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Wonderweiss Margera (ワンダーワイス・マルジェラ, Wandāwaisu Marujera) is the 77th Arrancar in Sōsuke Aizen's army and the only modified Arrancar under Aizen's command. Though not an Espada, Soul Society ranks his Spiritual Energy in the same class as them.

According to Aizen, all forms of rationality, memory retention, speech, and intelligence was purposely removed to enhance his power. Because of this, Wonderweiss's personality is very childlike, comparable to someone with autism; for example, when sent on a mission to kill, he instead played around with a dragonfly. He shows some hostility, firing a defensive Bala blast at one point, but quickly reverts back to his usual childlike state after doing so. In a later confrontation, Wonderweiss displays a higher level of hostility by stabbing Ukitake through the chest without any warning or provocation.

Wonderweiss does not speak in sentences due to his modifications, only saying a few drawling syllables at a time such as an infant would. The only coherent phrase he has ever spoken is his own name, immediately after being "reborn" as an Arrancar. Kaname Tōsen remarks that Wonderweiss, like himself, is a pure being (though he remarks he doesn't quite know what exactly is pure about him) who often tend to stick together; he claims this is why Wonderweiss follows him everywhere. It is implied that he tried to restrain Gin Ichimaru from approaching Tōsen because Wonderweiss was wary of him.