Thibo1102 used FaceYourManga.com to create the character models.
The models are not based on real life appearance; they are just character models Thibo1102 made up.
However, some models are based on users' actual FaceYourManga profile pictures. For example: Thibo1102, Poseidia133, Poseidon133, and BCtheBoss.
If you want, you can create your own character model for your character and then send Thibo1102 the image. Please don't make something over the top or weird.