I have all ready come up with one Koopa Gennie, she's the fire type and is called:

Lavia Yellowshell Koopa.

As you can see the others would be;

Redshell Koopa ( Water Type )
Blueshell Koopa ( Earth Type )
Greenshell Koopa ( Air Type )

Any ideas for names would be great!

Their shells are like lamps and if you get all four, who knows what you could do with them, oh by the way there cursed the use to changing a Koopa if remove by someone else, so finds Koopas!