I don't think Naorottam would be a nice guy, actually no one who endured so much in his/her lfe would be... my guess is he wouldn't even know the difference between right and wrong, all the people (except Vatsalya who was passive) ill-treated him, also made it look like they were right in doing so and he was wrong in many small ways, it was clearly shown he was bashed for smiling, was always asked to stay in the corner... he must have been psychologically effected by all these and there's no way he would still be normal, he should be the most dis-normal person in the LM.
I'm curious about the person he's secretly meeting as that person would greatly affect his actions and thought process.
I'm not saying his emotions for vats were fake, they could be very much real but still it wasn't normal for a person to not feel bad for the dead family member, he instead put out his desire to be in Vats's place. He is also shown as clever trying to emotionally manipulate people, saw it in several scenes, we never know he might have manipulated Vats too with his fake tears/emotions.
If anything I can only say Naorottam is the most complex character to read in this show and the actor is pretty geen, he has to improve his acting chops.