Redro

Redro is one of the most mysterious animatronic of fnae of all time, we do have clues to what he is. Seen in the photo, this is from fnae 2, and he's also appeared in fnae 2 in the beginning cutscene. He also appears in many other titles but is usually seen as a logo for Redros Tech or a plush seen from fnae 2020 remake. (seen in the next screenshot)