360Chadscope
Pixel Pirate
I don't think that Ice Golems, Wyverns and that kind of stuff should be considered mini-bosses, so I'm just gonna be that guy and say the Wyvern, because Souls of Flight are useful and wyverns just look awesome, albeit not very much like 'actual' wyverns.
If you really, really don't consider them an option, then I'd probably go for nutcrackers. They look cool.
If you really, really don't consider them an option, then I'd probably go for nutcrackers. They look cool.