He is still young and hasn't really hie puberty yet, so behaviour issues haven't shown up yet. Things can change pretty quick as he matures, and that can be in the next few months. Some rabbits don't change too much, but others can change a lot.
It would be good to get him neutered. He probably isn't ready yet, as his testicles need to be descended. You can talk with your vet about when would be good to get him done.
Remember that even when neutered, he will still be an adult rabbit and might not be like he is now. He can still be sweet, but won't be quite so baby like for long.