If used multiple times in the same room, the Gellos will eventually overlap perfectly and appear as one after some movement, but all remain functional. This makes Gello exceptionally powerful in Greed Mode, Boss Rush, and against The Beast.
Book of Virtues: Spawns a red wisp on the middle ring. The wisps will orbit Gello instead of Isaac while it's active.
Gello is a revenant in Greek mythology who causes infertility, miscarriages, and infant mortality.