Unown A - I'd say Number1ChanseyFan for "Advertiser", always announcing the events of Pokemon on the site, always keeping everyone well informed of 'em.
Unown F - This one is a Friendly person, and it is Mikachu_Yukitatsu.
Unown G - "Ghost for Mr.E. as he has appeared a few times, but he is still an active member.
Unown H - Houndoom_Lover for being "Hyper". Yup, she's hyper nice, hyper cheerful, and that brings hyper comments. Hyper happiness all the way.
Unown I - "Invisible" Kevin (nowhere to be found, but maybe he's around)
Unown J - to Master Of Paradox for being a "Joker". Some comments are pretty funny, you know?
Unown K - Blademaster for "Killer". He kills monotony with killer comments, killer signatures...killer...whatever.
Unown L - this one should be a "Leader" and I believe one good leader has been mr_pikachu. Hey, he's even participating in trying to restore TPM main site.
Unown P - I believe this one goes to Andrew for "Pick me up" as he made polls to pick new mods, thus resulting in two new leaders of TPM.
Unown Q -To Fett One for being Quick. (logs in, post, logs out in less than 5 mins, Cool!)
Unown T -This one goes for Gavin Luper, as he is a Tutor when it comes to opinions, and when giving advices.
Unown ! - I'd say PancaKe: as she made a surprising comeback (hence the ! symbol)