So I'll give you the rundown.
TommyInnit is 150% child. He's best friends with Tubbo, another youtuber guy. He loves to brag about how big his muscles are and talk about women and is rather sexist in a joking way. For example, "Technoblade, do you like women?" "It's a woman on the server get her out!" He also swears a lot, primarily using the words f**k and b***h.