>>2502103There's nothing wrong with OCs starting off as what seems to be carbon copies of more prominent characters; using big name characters as a sort of foundation for the creative process gives you a strong starting point, and as you do more and more work on any one OC, you start adjusting the character to better match your own interests and change details that you're less than fond of from the original design, etc., etc. Plus even if the initial design barely strays from the source material, it's not as if your first drawing or writing piece of a character is gonna set their character in stone; you've got all the room in the world to keep defining and solidifying their traits in your head and on paper.
tl;dr: don't be afraid if your OC starts as clones of other characters; keep working on them and make them unique.
The keyword bit that
>>2502148 mentions is also a good launchpad for character ideas that I've used a lot.