No super powers though... TWO FORMS: Owl Baby and Normal Owl!
/summon Bat ~ ~1 ~ {Attributes:[{Name:generic.maxHealth,Base:25}],Health:5.0f,PersistenceRequired:1,Silent:1,ActiveEffects:[{Id:14,Amplifier:1,Duration:199980}],Passengers:[{id:"ArmorStand",NoGravity:1b,Small:1,Invisible:1,Invulnerable:1,NoBasePlate:1,PersistenceRequired:1,ArmorItems:[{},{},{},{id:skull,Damage:3,Count:1,tag:{SkullOwner:Barnyard_Owl}}]}]}