Nao is going to have two summons.  I decided on the first one, but the second is still undecided.

1. Cheetahs

2. Giffens

3. Wolves

4. Dragons

5. Snakes

He will definitely summon Cheetahs but hasn't decided on the second one.  Let me know what you think in the comments and. I updated the Bio with his summoning.