Olrox does have the ability, in Symphony of the Night, to summon bats. This isn't just some power I made up. I actually went and looked at his sprites and his attacks and tried to model some sprites for him that seemed appropriate (but still fit into the confines of the CVRPG/DSWC universe).

Bats are one of those creatures that have slowly become more CVRPG-ized over time. They started out using Castlevania sprites (I think ones from Symphony), and then, over time, I just started swapping in bats from Secret of Mana (usually recolored, although Darkie in CVRPG is the original sprites' blue color).

Dunno if anyone cares that much about the bats to have noticed.
 
    

When evil spreads across the land, and darkness rises and the monsters roam. When the creatures of the night make beautiful music, and the things that go bump in the night go bump with greater enthusiasm. When the world is in peril and is in need of a hero...

These guys are, sadly, the best the world can hope for. These are the adventures of the heroes of CVRPG. They mean well, they try hard, and occasionally they do the impossible...

They actually do something heroic.