[quote=@FrozenEcstasy]
This is a rather interesting concept to me and I think I'll enjoy it very much.

I have an idea for a eccentric magic user with an affinity for the undead. If I can have an undead pet cat that'd be beautiful but I can understand if not.
[/quote]

'Undead' in the context of Invernier is applied pretty elusively to sentient humanoid-ish mummy-ish beings with a really loaded history, so I'm not sure a zombified cat would work, but since there's a magical style that revolves around wild animals, if you want a heavily enchanted cat familiar under your control, that'd be cool, sure thing.

What sort of eccentric were you going for?  It can end up meaning a few different things for different kinds of characters, and some of those may not fit well with the tone or setting for End + Sleep.