PS @RexLobo & Lore-Team, I miss you :(
We don't miss you (jk I love u will, PS: i'm new so idek.)
Anyways, I love making characters, I do it way too much and I vouch for will's answer but there is a way I make my characters up with which I feel like always works, cuz my characters are FIRE (yes, im biased) but as a new lore-team member and aspiring author (im copying will but its true)heres what I do
Basically it's look for stuff that inspires you, interests you or literally is funny to you, and use that as a baseline to let your creativity ramble loose on whatever baseline you have. This baseline can be a personality type: Bitchy, arrogant, Silent but Intelligent etc etc. Or a baseline can be something you want to have happened in his lore, which you can use movies, books, games etc. for inspiration. My example of this is my BMD character Tsujii, who me and thanks to robin who pushed me to do it, I based off a retro NES game from 1989 called 'The Money Game II' and then I mixed it with Wolf of Wallstreet stuff as well. Another baseline can be mental illnesses, what is something your character might have and why, for if you're interested in roleplaying out certain illnesses. My example of this is Ikiya, who I wanted to expand upon the idea of being a schizophrenic and 'sleepless man' (Parasomnic & Insomniac) which then yk brew to other stuff aswell
Creating a character is as easy as getting inspiration from something u played, watched, read wtv. And then putting your own twist and ideas further onto that story. Just make sure you don't copy it a 100% though. From there on out it is kind of relating to will's answer, let the roleplay be according to what that character, based on whatever you have (personality, backstory, both, etc.)