Making V's demons, griffon, shadow and nightmare (from devil may cry 5)

[Noxangelo]

So I've been playing DMC 5 lately and I was wondering what would be the best way to make V with his demons, especially shadow, he is awesome.

[Noxangelo]

The lack response to this has been quite depressing :(

But I have been giving it some thought over the past few days.

Griffon could easily be a familiar, a reskinned imp or mephit for UMD.
Nightmare could be a summoner's Eidolon or an astral construct. With a normal construct being a descent option too. the constructs book from mongoose's encyclopaedia arcane series has an option to summon the construct to you.
Shadow has been painful with me stumbling on a decent answer yesterday in the form of the warshaper class. so shadow would be something like a shadow creature were-panther cohort or one in the form of something like a shadow mastiff. Its not perfect but its pretty close.