Hi the same anon who said Celestial and Ice! I really want my OC to use Ice Make magic but it will undermine the 5 Ice Wizards(including the unnamed girl) he is a Adept level(medium) and use it for defensively or for fun his theme would be buildings or mythical creatures is it aright? Also is elemental keys undermine Lucy's celestial magic? its difficult to put a favourite magic in OCs D: and sorry if my typo is weird/bad. I am dyslexic myself so i kind of worried you will make fun of me. thx(:
Sorry in advance for my rather straight-forward response to your question.
Celestial magic is very demanding when it come to magical power. It simply cannot be combined with another magic whatsoever, your OC would pass out after a few attacks. Plus, it is over-powered beyond measures. You’ll absolutely have to pick either one, you can’t have both.
That being said, I don’t really get where you’re going with “elemental” keys, so I’ll assume it would be another type of key than Gold or Silver. If that’s the case, yes, it will undermine Lucy a lot. Since all Gold keys have an owner, the only choice left is Silver keys. If you want to make silver keys that revolve around elements, that’s fine. Just don’t make them a separate type of key.
As for Ice Make, I don’t necessarily think it’ll undermine the other 5 if you plan of having your OC in a different guild. If you look closely, each Ice Make user comes from a different guild. I guess if you respect that pattern, you’ll be fine.
Your molding themes are fine, just make sure you don’t use both. Either one is enough.