How do i make this character system?

I have a game in story mode and at the same time in free mode but I have a question.
You know that in my game there is a main character called max and every player that enters my game will enter and play with max of course,
my game has about 5 more custom characters though in the same way, wouldn’t it be weird if they all maxed out? at first? I also plan to save the player’s avatar in a folder in case he wants to use his roblox avatar, but I also think I’m going to put custom clothes on him. What do you think?
If you have doubts, no problem, I never know how to explain myself well. I have never made a publication of this type so I do not know the category if you know tell me
for those who don’t know max is a character that I developed that will be the protagonist of the whole story,
possible solution
What if I make a player have Max’s character when he starts, but the other players see him with his Roblox avatar, how would I do it?
excuse my English
THANK YOU
If you have any questions, please ask me. I beg you. I need your help. If I don’t answer, it’s because I have to help my brother with his homework or I’m working.

Please, I beg you, I’ve been dealing with this for days, please help me

Please, I would really appreciate it. If you have any doubts, just tell me.