Red and blue onis already have different dispositions and personalities.
Ogres too are different from both.
Ogres are more aggressive. They have war-like dispositions and get into brawls frequently, hence the broken horn.
Often they are surprisingly intelligent and thoughtful beneath that aggression. Something about layers.
There's more to red/blue onis and to ogres than meets the eye. However, given their immense size, it's hard to actually meet their eye, and often your eyeline is obscured by boobs.
Unlike onis, ogres are prone to wander and roam. Onis stay in their villages and communities.
Ogres don't have any weird zipangu mannerisms or expectations.
Physically they are similar. Ogres are probably slightly bigger and stronger due to hunting out in the wilds and living closer to the order, but it's very close.
All three enjoy drinking (but the effects are different on blue onis, with ogres being somewhere between the two in terms of constitution).
tldr marry all 3 and find out yourself. and buy a very strong bedframe.