Seems like those guys just keep comin' whenever.

I need to get myself stronger....

... What's that?

Fury teacher!! Fury is a coveted skill in arena because it raises stats at the cost of burning HP, although this doesn't matter in the short and brutal Arena battles. Hinata is generally considered a poor unit, but is a common summon and is by far the cheapest and most common source for Fury, so he's generally seen as nothing but skill inheritance fodder for better units.