This may just be personal preference but Kael and Otto just aren't that likeable. At least to me the mc didn't give Otto any kind of affirmation to his actions so it just feels creepy and while the mc did drop Kael's guitar the mc offered to pay him back yet he blame mc for walking in on him inappropriately changing in a room not meant for that so why would mc think he was changing and decides to physically assault him. (I don't care if he apologized, he put his hands on you and that tells you a lot about a person)
again these are just my opinions but I don't see any reasons to like them.
Also the body types are really similar and while that's not a problem we larger men covered with derrick a single leaner character wouldn't be bad just to have all the bases covered just incase someone doesn't like extremally ripped guys or larger guys.