If I were to only summon one pet, what should I go for? I see people use this purple looking leopard, but not sure what its called.
I’m arcanist/occultist
Purple pet is a manticore and you get it from the Nemesis Relic. It scales off Player Damage and not pet damage.
Maybe you’re referring to the manticore from https://gracefuldusk.appspot.com/items/2946-Nemesis
There are quite a few items which can summon things.
Occultist can summon a hellhound or a familiar (crow). The hellhound is much better at doing damage. The familar is better at buffs/support. It depends what you want out of your pet.
I am enjoying Occultist alot. I am using Hellhound and he is fine.