Stealing from/editing Some buddy's list
Jamie Dubs: KYM's first user.
Don: Site admin.
amanda b.: Former admin who left for Tumblr. Was also community manager, and this position has really never been filled since she left.
Particle Mare: Old fag mod. Notable in being a (joke) nazi pony. Demod when?
HolyCrapIt'sBob: one of the more stubborn mods. If you ever think dealing with mods today is bad, be glad you don't have to deal with Bob anymore.
(Mom/Professor) Rivers: KYM stats processor. Also hates what the site has become.
Loli: former mod notable for getting users riled up about breaking the rules. Despite name, know for cracking down on that material.
Platus: Oldfag mod, and brony. Know for actually debating users about topics even when they act like idiots.Will never use IRC or discord.
RandomMan: Old fag mod. Notable in being a former brony who has his own tag on Derpibooru.
Blue Screen (of Death): Former mod. Notable for having custom page before custom pages were banned, and his own Derpibooru tag and dakimurka.
Blubber: Old fag mod. Notable for never being a brony, having his Epic Brone sniper rifle take out bronies, working at TRU, and running the KYM Tiki bar.
Sir Soundwave: KYM's more notable Transformers user. Has been gone for years.
JackCandle: if you don't already know, you don't want to.
Natsuru Springfield: Old fag mod. Notable for being Touhou fan and contributing to Touhou article before most users were on the site.
Jacob: Old fag mod. Notable for being (joke) amish, uploading most of the Kantai Collection gallery, Bionicle nerd, and hating the admins, lewds and tumblr gallery.
Muffinlicious: Mod who has gone inactive. Many people thought they were a girl at first due to post style, and still joke about it.
Verbose: One of the few confirmed black people on KYM
Twenty-One: Old fag brit weeb mod who has largely left KYM.
Deltamelon: Mod who is rarely active but helped promting tagging and saved the reaction images gallery from lock. Also had child with ParticleMare.
Cat Monster: Creator of KYM-tan
Bill-Stan: Open dislike for anime and comments are frequently downvoted.
Mistress Fortune: big commenter with lots of people who respect her. Also biggest (no pun intended) body inflation uploader. Open about talking about very bizarre fetishes.
MIMU: pretty huge commenter with lots of people who like them.
HumbleWaterFilterMerchant: newest guy on this list, impressive the amount of attention he has garnered in a little bit over a year. Mimics Alex Jones in style.
CrustyClarinet: User with Cockatoo avatar and brony who deactivated years ago. Almost certainly the same person who started the "Wario is dying" jokes.
JollyJew: Old user with interesting reputation.
PatrickBateman: head ParticleMare worshiper.
TheGreatO: came close to ban a few times but managed to avoid it. Likes a lot of older (by today's standards) anime, Notably One Piece.
Nedhitis: User who mods and users have split opinions about. Also, NSFW.
JacktheDipper: Made large numbers of Expand Dong images and lots of tagging.
Kung Fu Cthulhu: the "Nedhitis of his day". Butted heads with mods on certain policies but overall good user. Hasn't been active in quite sometime.
Mako (The Spider Queen): mad threads that loosely Roleplayed as spider queen, though with name change those are likely done.
NeonWabbit: Planned millions of KYM projects but reports say they finished none. Also one of the keepers of KYM-tan lore.
Derpy Vaz: Actual Oldfag. Hates that KYM isn't more like 4chan. Was into memes before 4chan existed.
TripleA9000: Notable Gundam fan and one of the few confirmed black people on KYM.
GermanRaltz (changed name since then): Started the "black, 19, have a girlfriend and play several sports." Copypasta over Rosalina fanart being moved.
Desutodo+ Pinkiespy+Immaheman/Synge: helped to establish the Goat on KYM.
Taryn: has been memed on (sorry about mix up)
Emperor Palpitoad: annoying banned user. I don't get it.
Epyc Wynn: Asshole with a huge ego who pretty much everyone hated. Bernie Bro but also made Trump supporting account after true ban. Also didn't contribute anything to the site. Was banned and then unbanned then rebanned. This drama almost caused mods to leave the site.
Lez Huarez: Core shitposter, banned. See gallery. Almost never commented.
liberal_genius: Liberal bad user, banned.
calculator fetishist: Just posted calculators on top of female faces.
Jihad Jimmy: One of several Lez Wannabes. Avatar was that weird Buzz Lightyear face.
LisaLombs: Conservative poster who had attitude but was also actually willing to go into points. One of few confirmed female users. Also banned due to creating an alt during suspension. Notable for "Animal Kingdom" copy/pasta.
Arcanine: "Disgruntled ex-moderator who tried going out in a blaze of glory." Has created some alts to spam gore and porn.
David the NSFW Guy: banned NSFW user.
BluSpy: banned NSFW user.
Pachirisu: annoying little shit who was banned.
Hrom: user who liked animation and made lots of animation based uploads but also was not that good
Nebu: necro and gore lover.
Might be a little generous on some and less generous on others but that's most of my list. There are other users who left the site before I became a mod I still remember and feel like are part of the site, but few today know them. Also Mona being best mod but the things that make them best mod also make them not well know.