What is a serious but sweet personality type like for e.g. seriousness of Thomas Shelby but sweetness of some really sweet person (irl I’ve seen few people who have this personality irl so don’t say that this personality type doesn’t exist)

Just some time ago I started researching personality and tried to improve it. I learned about Thomas Shelby and Rocky Bhai (from KGF movie) and though they are the ones I should be like. I want to know more about this personality and most importantly, can you enjoy having this personality, or is it just for insecure people who wish to rule others xD. Btw when I gave the example of Thomas and rocky, I didn’t mean criminal personality I just meant serious personality and want to know if it could be sweet and serious at the same time (some people misunderstood the post I made and thought I was talking about how do I become don xD kinda, but I mean some people we see who are serious but sweet too)

Few things that I did that made changes to the behavior of other people towards me.

1. Making my voice a bit deeper
2. Talking less and avoiding immature and useless talks and letting others talk more than me
3. Talk slowly and talk with a deep voice (not too slow)
4. Made changes to my word selection and trust me this changed even how the people who were on the internet treated me, I spoke less and avoided spamming (but still a lot of times I forgot this)
5. Started behaving seriously
6. Got a mature and confident body language and behavior.

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Things I guess I missed and wasn’t supposed to be doing.

1. Overreacting to any situation like laughing too much or losing seriousness, tho I understand being serious all the time is not what we are supposed to be and to fix this I believe we can stop overreacting like we have seen a few people who started dancing and laughing like …. wtf, avoid it and add a bit more controlled behavior (I am talking about loose behavior here.
2. Having an awful fashion and grooming sense lol

I hope you understood what I meant by this personality and yea I don’t mean gangster personality (skip this if you didn’t understand what I exactly meant cause last time it got messed up lol)

Thanks

🔴Edit: Most people misunderstood this and thought I am insecure, but what I meant is that I wanted to learn about this personality type and wanted to know if these people are really happy or too insecure. One of the reasons I made this post was so that I could learn about it and decide if I want this personality or not. And also the words I chose for the title were shit and negative lol my bad