Zerofuku takes the form of a muscular young man with a hole in his chest located where his heart should be. He has long, dark purple hair with a horizontal streak of light hair along the middle of his hair's length. His irises are bright while his sclera and pupils are pitch black. The symbols on his cheeks are the radicals for the Japanese kanji for fortune (福) and the same symbol is on his tongue as well. He was described by Heimdall to be "small" and "child-like". The seven beads that tie his hair have the Japanese kanji for the seven deadly sins inscribed on them. Ordered from left to right, they read: Envy (嫉), Sloth (怠), Greed (強), Wrath (怒), Lust (色), Pride (傲), and Gluttony (暴).

Before being corrupted by the misfortuned absorbed from humans, Zerofuku used to have a child-like appereance. Being short and thin, having long white hair and skin and without the hole on his chest. He also had the same tatoos for the Japanese kanji for fortune (福) under his cheeks.

Following the fight against Buddha. Zerofuku recovered his original form for a brief period of time, before being absorbed into Hajun.

(Source: Shuumatsu no Valkyrie Wiki)