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- Voiced by: Tomokazu Sugita
- Voiced by: Hiroya Ishimaru
Known as the 6th Ultraman, Taro is an Ultra warrior that fought on Earth a long time ago. During the Dark Spark War he alongside his fellow Ultras was turned into a Spark Doll. For reasons unknown he kept his consciousness and some of his powers. He was the only Spark Doll that Hikaru could not Ultra Live into.
- Played by (Hikaru): Takuya Negishi
The protagonist of the series, Hikaru is The Chosen One of the Ginga Spark a legendary item of the Land of Light, that allows him to Ultra Live into various Monsters and Ultras through the Spark Dolls. He's also the host of Ultraman Ginga, a mysterious Ultra whose Spark Doll resides in the Ginga Spark.
- One Head Taller: At 6 feet, (even his actor in real life) Hikaru is basically a head taller than all his friends.
- Elemental Powers
- Blade Below the Shoulder: Ginga Saber
- Playing with Fire: Ginga Fireballs
- Shock and Awe: Ginga Thunderbolt
- Healing Hands: Ginga Comfort
- Color-Coded for Your Convenience: Ginga's light-up panels change color for these moves - blue default, red for fireballs, yellow for thunderbolts, and green for healing. They also turn purple for the Ginga Slash.
- Henshin Hero
- The Hero
- Jerk with a Heart of Gold
- Played by: Mio Miyatake
- Played by: Kirara
- The Cutie
- Green-Eyed Monster: Her jealousy towards Misuzu getting chosen to replace an idol instead of her, leads her to DarkLive into Ragon and attack Ginga. She gets better.
- Idol Singer: Her goal.
- Played by: Mizuki Ohno
- All Love Is Unrequited
- Locked Out of the Loop: Initially and to his frustration, which makes him easy prey for Valkie-seijin.
- Played by: Takuya Kusakawa
A classmate of Hikaru and company, who is known to be quiet and non-social, however he has a strange interest in Hikaru. He's actually Jean-Killer's pilot and an enemy to Hikaru/Ginga.
- Heel–Face Turn: In episode 6 after being defeated by Ginga, and understanding the importance of dreams.
- Lonely Rich Kid
- The Only One Allowed to Defeat You: In Episode 6, he is given a dream to defeat Ginga. The person giving said dream is Hikaru himself, and it shows, as it becomes the driving force for his Heel–Face Turn.
- The Rival: To Hikaru
- Played by: Kiyotaka Uji
Monsters and Aliens (In Ultraman Ginga)
- Voiced by: Tatsuya Hashimoto
Black KingSee Return of Ultraman
Thunder DarambiaSee Ultraman Dyna
Kemur-ManSee Ultra Q
King PandonSee Ultra Seven
RagonSee Ultra Q
DoragorySee Ultraman Ace
Jean-Killer / Jean-Nine
Created by Beatstar as the ultimate anti-Ultraman weapon, Jean-Killer is a robot piloted by Tomoya. Originally a sentient being and an ally of Ultraman Zero, Jean-Killer lost his consciousness and was turned into a Spark Doll during the Dark Spark War. Through the Gunpad, he can return to his original size and be piloted.
- Heel–Face Turn: Alongside Tomoya in episode 6, returning to his heroic name of Jean-Nine.
- Humongous Mecha
- More Dakka: Jean-Killer is loaded with fireweapons.
- Laser Beams
- Jean Cannons
- Jean Buster
- Gunpad: Obtained after becoming Jean-Nine, the Gunpad is not only another weapon to his arsenal, but it also boosts his previous attacks.
- Red Eyes, Take Warning
- Sixth Ranger
- Transforming Mecha: He can transform into the spaceship "Jean-Star".
Alien Nackle Gray
- Voiced by: Kunji Hirano
Dark GalberosSee Ultraman Nexus
Red KingSee Ultraman
JashrineSee Ultraman Mebius
Super Grand King
- Voiced by: Tomokazu Sugita
Monsters and Aliens (In Ultraman Ginga S)
Alien Chibu Exceller
- Voiced by: Takuya Eguchi
- Played by: Moga Mogami
EX Red King
ElekingSee Ultra Seven
Alien Guts Bolst
- Voiced by: Horii Kaneko
ImperisersSee Ultraman Mebius
King Joe CustomSee Ultra Seven
SadorahSee Return of Ultraman
GudonSee Return of Ultraman
YapoolSee Ultraman Ace
VakishimSee Ultraman Ace
Fire GolzaSee Ultraman Tiga
Gan QSee Ultraman Gaia
BemstarSee Return of Ultraman
VelokronSee Ultraman Ace
Alien Akumania MuerteSee Ultraman Leo
Alien Metron JaceSee Ultra Seven
Zoa MuruchiSee Return of Ultraman
BirdonSee Ultraman Taro
Alien Zetton BerumeSee Ultraman
Hyper ZettonSee Ultraman Zero
Monsters and Aliens (In Ultraman Ginga S: Showdown! The 10 Ultra Warriors!)
Alien SranSee Ultraman Max
Dark MephistoSee Ultraman Nexus
Alien EmperaSee Ultraman Mebius
Ultraman BelialSee Ultraman Zero
Monsters and Aliens (In Ultraman Ginga Specials)