These are almost guaranteed to not be coming out of retirement.

Rodney Skinner | LXG | barefacedliar
Jade | BG&E | graceofanox
Aaron Hotchner | Criminal Minds | fightsbadguys
Wally West | Young Justice | wal_man
Todd Anderson | Dead Poet's Society | quiet_desperation
Basil Halward | Dorian Gray | student_of_beauty
Dylan Piper | Halloweentown | dorkyanddateless
Gellert Grindelwald | HP/FB | sought_mastery
Salazar Slytherin | HP | serpent_tongued
Terra | KH:BBS | darkened_dreams
Kenzi | Lost Girl | be_your_robin
Maya Hansen | MCU | off_shore
Howard Stark | MCU | has_the_best_toys
Brooke Banner | MCU | disproving keeps_silent
Kyra | Riddick | keeping_up
Jackson Whittemore | Teen Wolf | unidentifiable