MU ideas (all based on real myths)
1. Ammut- A female demon from the book of the dead. It devoured the souls of bad people. It had a crocodile head, a lioness body, and the hind quarters of a hippo. It's Egyptian.
2. IcthyoCentaur- Basically a Centaur with a dolphin tail. It could be a land/water unit like someone asked for.
3.Chrybdis- A kind of whirlpool or vortex, devours ships, but would be stationary (a kind of blockade). Greek
4.Cercropes- Basically, monkeymen, and I don't know what kind of purpose they could have. Greek
5.Golden Ram- It was a flying goat with golden fur, could be an air/land unit. Greek
6. Tritones- they looked like mermen with horns, and were a kind of river god. Greek
7. Orthus- Cerberus' two headed brother.
8.Typhon-A monstrous giant with one human and ninety-nine animal heads, two hundred hands each tipped with fifty serpents, a pair of serpent tails for legs, giant wings, and a fire-breathing maw.
9. Garm- The norse dog who guarded the underworld, looking at him turned you to stone, he was big and powerful, and couldn't be bred because he ate the pups.
That's it for now, I can't think of any more at the moment, but if I do, I'll let you know.