username

I want to change my MC username. Is there a chance that i will lose my rank or will there ve no problen

Hi, I was wondering how I would go about changing my in game username, right now it is Jaren0916 But now I want it to be TheBossJaren. If any of you could give me insight or advice, please reply and tell me! Thanks!

If you play creative, factions, kingdoms, skywars, kitpvp or just happen to see me join the lobby you'd know I have a lot of ranks. On skywars - VIP+ / On creative - Shadowfox / On kitpvp - VIP+ / and the member rank on everything else. However I wish to change my username and I will not until...

Sooo... Recently, I donated to the creative server and recived the ShadowFox rank. I have seen many players with multi-colored usernames. Is there a command for this? Answers are greatly appreciated :)