Another Century's Episode 2
- Voiced by: Naomi Shindo
Pilot of the second Gun-Ark, she goes missing after the battle at Torrington Base.
Another Century's Episode 3
- Voiced by: Daisuke Namikawa
The protagonist of A.C.E. 3. Born "Barrel Baldona," he's an ordinary student who ends up as the Ixbrau's main pilot after meeting Fei.
- Ordinary High-School Student: Just your average kid in high school until he gets caught in an attack by unknown life forms.
- Voiced by: Daisuke Namikawa
A mysterious man in a mask, he serves as the pilot of the Blood Ark.
- Final Boss: He serves as the last opponent fought in A.C.E. 3, piloting Shin Getter Dragon.
A pilot in Berkt's squad.
Another Century's Episode: R
- Voiced by: Miyuki Sawashiro
The protagonist of A.C.E. R, she serves as the de-facto captain of the Ark Alpha, as well as the pilot of the Alpheart. She has no memories of her past, but she appears to be gathering "irregulars" who have been transported to Planet Eria.
- Voiced by: Kanae Oki
Guardian of the Sea Plant, appearing as a young girl.
- Voiced by: Tsuyoshi Koyama
Guardian of the Geo Plant, appearing as a large man.
- The Brute: He has the appearance of a huge, ripped male, and his main role is to provide Season with some extra muscle.
- Voiced by: Yuka Komatsu
Commander of the Air Plant, appearing as an adult woman.
- The Dragon: She's effectively Winter's right-hand woman.
- Voiced by: Ryōtarō Okiayu
Leader of Season and the administrator of "System ACE."
- Bad Boss: Will use a Forcible Command on his allies to control them if he feels he isn't having his way. Or outright kill them just for an opportunity to kill the heroes.
- Big Bad Wannabe: With the reveal that Dr. Shiki was inside influencing him the whole time, his lack of control over the situation is laid bare.
- Pretty Boy: In contrast to Summer, he's much more slim with fine facial features.
- Unwitting Pawn: He had no idea he was dancing to Dr. Shiki's tune the entire time.
Dr. Shiki
- Voiced by: Banjo Ginga
The creator of the Season androids. He was believed to have been killed by his creations, but...
- Big Bad: He's the one behind all of Season's atrocities.
- Walking Spoiler: The fact that he's alive and the Big Bad is not revealed until the final stage.