You telling me that if I'm not levelling my alts I'm not playing them the way you want is so, so hilarious. "You can be everything on one character so you don't need other characters, if you're not levelling them then clearly you don't care."

1) You don't have to level to RP. I don't RP in XIV but I have in other games, and I had plenty of level 1 or very low characters because of that.
2) I've got alts because they're the remakes of characters I had in other games that I love and miss. Beryllia, my lalafell archer, will never play like my hobbit hunter from LotRO, so I'm not keen on playing her, but I miss her, and it's fun to log her in and play with emotes.
3) Some of my characters exist simply because I wanted a character of a specific race and gender to dress up.

If you want the same original name that someone else has I find it exceedingly hard to believe, and if you want the same "fandom/gimmick/cosplay" name, get in line. It doesn't belong to anyone beyond the original creators and you have no more right over it because you want to level as someone at level 1 has because they got there first.