Saw this tread while surfing and had to add a few i discovered.
Angel + Cait Sith = Shisa lv13
Hua Po + Slime = Datsue-ba lv 9
Hua Po + Angel = Alp lv8
Harpy + Gram = Mou Ryou lv11
Angel + Slime = Andras lv15
These aren't the only combinations i found but the rest are just upgrades to the same family, enjoy.