I really don't like being involved in these conflicts, but I feel like I need to speak up:
Antares, for one thing, I really appreciate that you are interested in this RP. Believe me, though, you're not the only one. Like you, we have all asked whether our PCs could be both Trainer/Breeder, Trainer/Coodinator, be teacher assistants, etc. Chimchain has, politely, told us "no." We respected that and dropped it. I understand that you want your character to stand out, but you could make your character stand out without having to resort to getting authority. You said you have raised 4 cousins, which makes you mentally capable of handling the younger students, but also uncomfortable with playing as a 15 year old. While raising 4 cousins is admirable, it should not be a reason to say "I deserve to play a teacher/mentor role." I am actually playing a character that is outside of my comfort zone. Not only am I not outgoing like Danielle, who is white and can speak French and teases the hell out of people, Danielle is also 7 years younger than me. That's right, I'm shy like Lana, is Asian and can speak Chinese... And I'm 22 years old.
Second, role models do not have to be older characters. They can be students or even Pokemon. You could play as a 15 year-old student who has experience with children, like yourself, which would make your character more mature and it would still achieve the same result as having a alumni/professor while still enjoying the benefits of all of the events taking place. There are many ways to make a character stand out without taking the reins.