- Doctor J: The man who was responsible for the training of Heero Yuy and developed Wing Gundam. He is also the unofficial head of the Gundam Engineers. His white hair hangs long and ragged, past his shoulders. He is also distinguised by a cybernetic arm and leg, and he always has dark goggles secured tightly over his eyes.
- Professor G: The man who took in Duo Maxwell and made him the pilot of Deathscythe which he had developed. His hair is cut to vaguely resemble the head of a mushroom. He has a very bushy mustache and an improbably long nose.
- Doktor S: The engineer who created the Gundam Heavyarms, Trowa's gundam. His assistant shot the real Trowa Barton when Trowa reveals that he fully intends to execute Operation Meteor as originally intended. His short, grey hair stands almost straight up, and he has a peculiar prosthetic nose.
- Instructor H: A friend of the Winner family that developed the Gundam Sandrock, Quatre's gundam. He hid the plans for Wing Zero in the Winner family's database. He is rather fat, with a receding hairline and a thin, dark mustache that stands straight out at each end.
- Master O: The man who developed Gundam Shenlong, Wufei's gundam. Of imposing stature and bald as a cue ball, the powerful and athletic Master O is an expert in many forms of martial arts.
- Howard: While Howard did not develop any of the 5 gundams, he was one of the original gundam engineers that developed the Tallgeese, the prototype for all mobile suits. In the series, he assists the Gundam pilots and is the owner of the space ship Peacemillion. His Hawaiian shirts and wraparound shades make him the most colorfully dressed character in the series.