Need some help here please

So i have a naga character that can switch back and forth between his human and naga form. He only uses his naga form when he feels his human form is not enough.
What can he do as a naga that he can't as a human?

Heightened senses

Strength and maybe animal features

ah ! i also have a naga character, but he's a naga all the time-
one thing i can think of is; what kind of snake is he?
cuz that might influence his abilities
depending on what type of snake he is, it lets you know if he has venom, how deadly that venom is, and how strong he is (if he's a python or something-), AH! also if he's good at camouflaging, depending on where he is at the time and whatever kind of snake he is-
'nd just,, stuff like that you know?
i hope this helped!