Keel

"They must have programmed me in DOS."

- Keel's self-kill message

"Your mom, [enemy]. She as ugly as you?."

- Keel after being killed by an enemy

Keel appears in and is a playable character in Quake 3 Arena, and Quake Champions. He is an enemy warrior in Tier 5 in the singleplayer mode of Quake 3 Arena. He favors the Railgun and Rocket Launcher. In the chat, he is also mentioned by the bots as "Tin Man" and "Metal-Head", "Keely" and "Keel-Hauler".

Quake III biography
Lance Corporal Ben Keel died during the Spiker Insurrection-only to be revived as a humanoid battle machine by scientists experimenting with captured alien biotechnology.

Keel is a cybernetically enhanced warrior: the product of Terran refinements on captured alien bio-engineering. Much more than power-armor, but substantially less than human, this man-machine is programmed to fight, to kill and to overcome the enemy no matter what the odds.

Trivia
Keel-Bright skin is also widely used model that large amount of players on the game use for enemy models in Quake Live multiplayer. That's probably he has the highest and largest model in game which fills almost the whole hitbox height and is quite easy to notice.

Shooting keel in the robotic parts will still make him bleed, Possible due to engine limitations.