K-9 - Maximal Guard Duty
Kaen - Cybertron Heavy Mobile Fighter
Kakuryu - Destron Strike Soldier
Kick-Off - Autobot Security Expert
Kickback - Decepticon Espionage
Kickback - Decepticon Decoy #39
Kickback (Robot Heroes) - Decepticon
Kickback (Universe Classics 2.0) - Decepticon Agents
Kickback (Energon) - Decepticon
Kicker - Cybertron
Kicker (Anniversary) - Cybertron
Kicker (Energon) - Autobot
Killbison - Autobot
Killbison - Destron Military Engineering
Killerpunch - Destron Intelligence Officer
King Atlas - Autobot
Kingbolt - Micron
Kirk - Cybertron
Kobushi - Decepticon Mini-Con
Knockdown - Autobot
Knockdown (Universe 2.0) - Autobot
Knock-Out - Autobot
Knock-Out - Mini-Con
Knockout - Decepticon Battlefield Fortification
Knockout - Mini-Con
Knock Out - Autobot
Knot (X-Dimension) - Micron
Kranix - Mini-Con
Krok - Decepticon Foot Soldier
Kup - Autobot Warrior
Kup (Targetmaster) - Autobot Warrior
Kup (Botcon) - Autobot Interstellar Patrol
Kup (Sergeant, Generations) - Autobot
Kup (E-Hobby United) - Autobot Warrior