Pets:
Scamp: Not a bad option even on a pet hybrid, just another AoE.
Clannfear: Has wonky scaling with max magic, passive attack scaling with physical damage, and active ability scaling with health.
Storm Atronach: Recently now has better magicka and (to a lesser extent) stamina scaling.
Twilight Matriarch: Healer? Probably not.
Twilight Tormentor: Just no.
Morkuldin: Why not?
Ballista (Bow Ult): The ranged brother of Morkuldin as a bow... (Not actually a pet).
Cat: Vanity pet.