i got this pet and like to change him.. https://subeta.net/pets/Orvit

what species and color would be the best?

Well, what do you want that pet to be? Cadogres are already pretty alright. I love the Storm and Angelic ones, and the Darkmatter one's cool too!

You could always just zap the pet with the Zapper v2 until it turns into something you like!

well i want something that will fit his name

Since his name is Orvit it really reminds me of Orbit (Which I think was the point?) But yeah playing off of that you could go for something Galactic? Or you could take it a bit further and base him off of Orbit gum? So maybe a Glacier pet because the gum is suppose to taste icy cool like mint and you could fill his treasure with gum type items etc~ (And maybe a little funny thing could be that his name is like that because he's always chewing gum so he can never say it right or something silly like that. :x)

Also if you intend on keeping them a Cadogre I think both of those colors look cute on that species~ (especially the Glacier imo~)

Anyway I hope you find something you like for them!