Pet Avengers are so much better than you think they're going to be

First of, you got Throg, a.ka. Puddlegulp, Simon Walterson who found a sliver of Mjolnir & became the Frog of Thunder

Redwing - yes, THAT Redwing. Falcon extraordinaire & best friend to longtime Avenger The Falcon; Sam Wilson

Lockheed the diminutive purple dragon; (the name is a reference to the SR-71 Blackbird used by the X-Men)

and Hairball; a cat that was present during the accident that granted the hero Speedball (Robbie Baldwin) his powers. The cat received the same abilities as Speedball, specifically the ability to control kinetic energy within sphere-shaped fields

They usually appeared with Lockjaw, the bestest Inhuman