Mike Bock's version looks cool, but that's not really the look I envision for him. In my mind, Batros's design is very literal, going along the lines of Man-Bat from DC.
Plus, in my MOTU canon, Batros is one of the last surviving members of Hordak's race (perhaps Hordak killed them all?). He's a Preternian that's been in hibernation all this time. Thus, the bat symbol that he wears isn't a symbol of the Horde, but a symbol of his race, that Hordak simply uses as well.
In fact, the name "Batros" probably isn't even his real name, but rather the name of his species that he took on, as a tribute to that legacy, being one of the only surviving members.
The only distant cousins that the Batros (the race) would have, are the Spileans (the bat race from 200X). They are to the Batros, what the Reptons are to the Snake Men.
Hordak and Batros are aware of each other (especially since Hordak's rertun to Eternia), but basically steer clear of one another.
At least, that's how it works in my canon.
