Hello Hello, Darling! I was reading your plot thread and would like to throw one of my senshi at you.
Currently, I have two! And honestly, which one we try is all dependent on which way you wanna go.
Super Sailor Chara - He's my baddest of bads littliest shits around! He likes to fight, and LOVES to punch first, ask questions later! If you want to have a fight that pushes him closer to the Negaverse, he's your guy.
Sailor Fornax - On the opposite side of the Spectrum is Sailor Fornax. He's a Fledgling(ish) Senshi who awakened some time ago, but thew himself into school for a while and ignored the senshi business. He knows all too well how horrifying the Negaverse can be, so he's great to talk to if you want to get a not-from-the-inside look of the Organization. He's very calm and is more than happy to stop and talk, even if the Negaverse scares him to bits!
Let me know if either of them sounds good to you!