- 9 Knuckles
- 6 Koen "@||_Y0UR_B@SE" Heltzel
- 3 Koen "Sp!Re`" de Jong
- 4 KOFF
- 7 Kopruch
- 2 Koray Avery Cyber'nerd'
- 5 Krazy Darcy
- 6 kries
- 2 Kris 'Zing' Hornseth
- 30 Kris (R3plicant) Andrews
- 4 Krono
- 2 Kronon
- 2 krs.kio
- 13 krs.ks
- 32 Krull
- 2 Krulwick
- 2 krummi
- 3 Kryss Oroborus
- 4 KrystoF
- 2 ks-gust & nekoneko=[SAK]=
- 4 ks-gust-
- 2 ks-gust- & nekoneko=[SAK]= & Talisman' Willard
- 2 Kua "Distant Land"
- 4 Kuba'Deadkatz'Cieslik
- 2 Kuja #kuja (Qnet)
- 8 Kuldiil
- 7 KuroiTenshi
- 9 kurt'commander_keen'loeffler
- 13 Kuznetsoff Dmitry aka -=_Buran_=-
- 9 kvak
- 9 Kyle "K6599" Keiderling
- 2 Kyle "Striker" Pittman
- 15 Kyle 'Dace' Brunette
- 4 Kyle 'L4Y Duke' Black
- 3 Kyle Monster
- 2 kyle the great
- 2 Kyo Hiroshima (DiE)
- 3 Kyouryuu
- 3 Kyrexus Dragellus