Official, not yet
There is a third-party class "The Grafter" though, which allows you to do some of these things.
Did you ever get jealous of those sweet abilities monsters have? This is no longer an issue! With the Grafter class you can slowly but surely become a monstrous abomination yourself with all the sweet perks it brings! This is a class for those who like to hunt down monsters for their parts and then use those parts in battle!
The grafter class includes three archetypes: the monster, the symbiont and the witch.