It's way too early to think of such a thing, I feel. Everybody usually needs to build a foundation first and if you have fun concepting characters, write trivia about them and it's a fulfilling process in itself, Seb, then that is pretty good.
If you feel like people might not get your submissions well enough, you could always try to work with the folder system and sort your submissions by personally chosen group tags.

Thanks for the advice pal ^ω^

I don't think of writing trivia about my character, even if I know them. I think that adding a few more informations in description wouldn't hurt ^ω^"

And for the folder system, I don't know it very well, I should get information about it and try ^ω^

It works pretty much like on your file explorer. A folder groups all the files inside it. It works the same here. Choose a title under that you want to collect submissions. You can mark and sort submissions even to several folders.
In the end, you still have the main gallery appearance with all your files uploaded but you click on the list of folder titles on the left now, you get only the submissions that got put there by you. You can even add a description for the folder additionally.