The mods can't really do anything about it if it's with the default markings, and/or mass/legendary markings, but if it's a preset, then I suggest speaking to a mod about it.
Can anyone get banned from "stealing" my characters looks?
It does depend on the situation but in most cases it's a no. If seen needed we can take action against users causing trouble but as far as characters goes made within the game using the original set of markings and tools provided in character creation to make your character, no design or look can be claimed by "you" as a user neither can it belong to you and you only. We've said this many times before and will repeat it in this thread as well. All tools and markings provided in the game is there to be used by everyone, even though there's plenty of space for creativity and unique characters there's only so many ways one can make a fox or a zebra. Certain combinations of markings will be more popular than others and we need to take this into consideration. We also need to take into consideration if there's more on the line like "Impersonation" or a user trying to take someone else's identity or claim someones work as "theirs".