OMGator is a cartoony alligator who's standing on his hind legs. He has one eye normal and the other in red and yellow, and wears a leather vest with an open front.
He appears to wear an Australian-style hat with types of teeth on it which may or may not be alligator teeth, which is ironic, considering he is one. He wears a necklace with a single tooth on it.
OMGator is easily surprised by things which also ironically cause his death and overall he behaves calmly and kind-heartedly. It's unusual that when he was struck by Papa Bolt's thunder he didn't show much reaction from it.
Makes those possessed as very easily surprised as he is.
Ottamagator's name is a combination of ottamageru (おっ魂消る, "to be flabbergasted") and alligator.
OMGator's name is derived from [OMG a saying of Oh My God a saying when surprised or shocked at something] combined with Gator a shorter name for Alligator.