In one of my previous questions, I asked about how to get solid concepts. This one is similar but I'm asking what to do if I have two characters with similar concepts but whose differences make it difficult for me to decide who gets into the story and who gets scrapped.
The characters I am writing still has some writing needed to be done; I still need to decide their personalities. As far as I can come up for now, I have 2 characters that have the same concept of being a mentor figure to a certain character. Both are arrogant, but they do have their fair shares of differences. One dislikes socializing and often sees others as a hassle; one simply is much older and fits as more of a father figure than the previous one (and older brother figure), and they both like to take the spotlight. They have different occupations and stories that would influence the apprentice/successors.
I had the idea of using them both and make them the trope of two mentors with different ideals. On another hand, I could eliminate one of them and things would effect the character differently.