The following is a list of prominent characters featured in Mental Omega.
Allied Nations
- Allied Commander - A U.S. commander and the player character for the Allied campaign.
- Michael Dugan - President of the United States of America.
- Tanya - A U.S. special operations agent, equipped with a prototype laser rifle.
- Siegfried - Protegé to Albert Einstein, brilliant scientist and CEO of SteinsTech Labs, responsible for many of the Euro Alliances technological feats, including the more modern Chronosphere. In the field he pilots an unstable "Zeitgeist" weapon platform.
- Norio - Former Tokyo police officer, now a member of the Pacific Front Rocketeer Division. Holds a strong sense of right and wrong. Pilots a "Garuda" power armour, being more resistant to AA and equipped with a cryo rifle and rocket launcher system.
Soviet Union
- Soviet General - A Russian general and the player character for the Soviet campaign.
- Alexander Romanov - Premier of Russia and de facto leader of the Soviet Union.
- Boris - Hero of the Soviet Union, a Russian special forces operative. Led the charge into New York City but was quickly killed in action.
- Volkov & Chitzkoi - Former Heroes of the Soviet Union. Left abandoned and disused in Eastern Europe after the second Great War. Reacquired and reactivated by Russia prior to the third Great War.
- Yunru - Chinese child prodigy. Singularly responsible for most of China's military technological advancements that allow them to remain competitive with the Allies. While patriotic to China she is nonetheless forced to remain in service in the Chinese army with her family being held as hostage, shows signs of mental degradation due to this. In the field she wields a prototype power exoskeleton that lets her carry a powerful Earth Breaker weapon.
- Morales - Former Cuban death squad commando and the deadliest assassin of the Latin Confederation. Wields a high power sniper rifle with incendiary ammo that can pierce through multiple targets, infantry and light vehicles alike. Authorized to call in airstrikes.
- Reznov - A Colonel serving under the Soviet Commander, commands military forces in the United States. Uses a sniper rifle and explosive charges in combat.
- Krukov - A Colonel serving under the Soviet Commander, commands military forces in the United States. Armed with a radiation gun and smoke grenades.
- Xiu Rong Wu - A Chinese general who leads Chinese army to invade Russia.
Epsilon Army
- Yuri - Founder and leader of Epsilon Army and its primary wing PsiCorps. A powerful and dangerous man with great ambitions.
- Yuri's Proselyte - An Epsilon field commander and the player character for the Epsilon campaign.
- Rashidi - Leader of Scorpion Cell, a North African terrorist/freedom fighter.
- Rahn - The ultimate result of Epsilon super soldier research. Highly intelligent being with a 'survival of the fittest' mindset. Armed with a powerful piercing railgun that transforms infantry into loyal Brutes.
- Libra - One of PsiCorps' most powerful psychics, perhaps rivaling Yuri himself. Her great power can turn entire armies into dust, but her power makes her highly unstable as she suffers from violent mood swings.
- Malver - Top assassin of Scorpion Cell and close friend of Rashidi. A unique psychic that solely learned and trained his psionic powers in isolation over many years.
