Ooh! I like this! Here I go:
1. Pikachu. Obvious reasons.
2. Charmander. People know it's a Pokemon, and it would also make for a killer nightlight.
3. Cyndaquill. It's adorable, well behaved, and would make a nice pet.
4. Totodile. See reasons for number 3 except Totodile is hyper.
5. Ditto. It's a transforming Pokemon. If you can't figure this one out, wow.
6. Chikorita. My house smells sometimes, so it's a real good pet!