Parmandur
Book-Friend, he/him
As strange as this sounds, I think Sorcerers make sense for Simic Hybrids, because the "original" can be a result of the experiments that made you a hybrid.
Examples Dragon Blooded Sorcerer Simic Hybrid, when changing you, they mixed some Dragons blood and scales with Octopus and Manta Ray parts from the other creatures.
Xanathar's Guide literally suggests "I'm the experiment of a mad Wizard" as a fluff originally n for Sorcerers.