Natasha the slime

Can multiply into 2 minions when defeated.
Slime minions will grow back to herself if they are well fed, so you can hoard an army of slimes with the proper tactics.

Eze the Harpy

Aerial unit, so cannot be targeted by melee units. Also effectively destroys barriers and buff fields.

Iblis the feeder

Will automatically feed your backline supporters if she defeats a prey, prioritizing the ones with an empty stomach.

Check it out