How to create one or more characters and put them on a list to select and start the game?

Hello, I have a character customization system, in it I can customize my character and the custumization is saved in the character even if you start or return in the initial menu, so far so good.

Now, I want to build a system where in the customization part I can create a character with this customization and then be able to create others with different customization, in other words, what I’m looking for is something like in mmorpgs where you have a place, it’s yours characters, you can create, choose the characteristics and actually create to appear in the list of created characters, it is now possible to delete, start the game with the selected character or delete. I can’t find any tutorial on what I’m looking for.

What I’m looking for is something like this image:

You don’t need to create separated characters, you need to apply new stats to one character on selection.