1) Shivaaye is shown to be the most arrogant and rough&tough kind of a person, but he probably is the softest, even a small thing hurts him (we might hate him for what he did to Anika but the truth is he got hurt by what she did and instead of accepting that he is hurt he just started behaving arrogantly) he is the one who is most disturbed by the family and has therefore even got a cardiac problem.
He however knows that he can not reveal his softer side expect sometimes to Om
2) Omkara- He is shown to be the emotional and aloof person who is only involved in his artform and brothers, but I personally feel he is very strong inside. He was a drug addict but overcame that issue (maybe with the help of Shivaaye, but still in such matters what matters the most is self determination and not others support) he has the courage to challenge the most powerful person in this country (which is Tej as per the storyline 😕 😕 )
He knows that his brothers need him to vent out their emotional turmoil and therefore shows to be the same
3) Rudra- He is shown to be a spoilt younger bro, kid heart, but as that was reflected in Rumya convo, he is neither, he probably is the most sensible of the trio, it is he who joins them, whenever he feels that his brothers might get differences, he sorts them out in the most unconventional ways, he knows that the only foundation of the Oberoi mansion is the love of the three brothers and therefore is ready to do anything to keep this love intact
He knows that his brothers like to see him carefree and Bindaas and therefore behaves in the same manner
I think the brothers are not what they are from inside but what the other two like them to be
Just my opinion could be wrong