Blame a man who practically created a genre, a good book and is now dead. Awesome.
Seriously though, half species: should they be mish mash of stats for the parents or be their own thing entirely, like Tusk Riders. I am leaning more towards this idea.
Netwling/Slarge Cross (could it work?)
Wind Child Orc mix (wingerd Orcy thing)
Minotaur and elf cross? A horned elf? Not looking like a Satyr hopefully.
Trollkin and a broo. Horned green thing.
Ludoch and a Troll (water troll thing with big tail? I like that idea)
Arachan Timinit and human (spider man, LOL)
Giant crossed with a Orc (Giant Orc)
Slarge/ogre (some sort of even more vicious or dangerous Slarge, or a demonic looking ogre?)
Elf and an Ogre? (interesting mix)
Maybe only let a few races be able to breed with others/give birth (Trolls, Broo, Ludoch, Humans, Elfs, Orcs, Windchildren, Slarge). Stragner things (well probably not so much) have happened in star trek.
But what else can be crossed? Big epic monsters (trying to avoid dragons, angels and demons here). What about a Cross between one of those Catoblepas things (that purple chaos horsey thing from Monsters 1) and a broo?