Tony-
You get a cat. (Because RDJ has two or one or more cat(s).)

Wanda-
You get a cat

Clint-
You get a parrot. You named it Sparky.

Steve-
You get a dog.

Bruce-
You get a parrot that you named Green Beans.

Peter-
You get a dog.

Thor-
You get a dog.

Natasha-
You get a cat.

Loki-
You get a cat.

Bucky-
You get a dog.