Cheng, a young sage from Planet Tria and the newly elected president of the Tianheng Association, embodies the wisdom of the phrase, "All things return to oneness." Driven by a benevolent heart, he shelters civilians displaced by war and champions the radical idea of coexisting peacefully with interstellar predators threatening his home. Despite his compassionate vision, his proposals are deemed too unconventional by the established intellectuals, ultimately leading to his exile—a setback that only fuels his resolve to bridge the gap between worlds.

Nova is the embodiment of the Otto civilization's central intelligence, forged in the depths of an ocean of data. Tasked with calculating the complexities of time, space, and imminent battles, he strives to safeguard his civilization as their main star teeters on the brink of collapse. Yet, amidst the relentless streams of information, he detects a more profound crisis lurking beneath the surface, hinting at challenges far beyond their immediate peril.

Roena is a charismatic and skilled theatrical magician from Ember City, known for her mesmerizing performances that blend illusion and charm. Rescued by the rebels during a critical moment, she now uses her talents to aid the Sora Corporation in their fight for freedom, bringing a touch of enchantment and a strategic mind to their cause. With her flair for the dramatic and quick thinking, Roena adds a unique edge to the rebel team, captivating allies and foes alike.

Tina is an exceptional Starfleet navigator with a remarkable memory and extraordinary calculating abilities, honed since childhood. Her passion for aerial vehicles, combined with her keen analytical skills, makes her an invaluable asset to her team during missions. Tina's resourcefulness shines through in critical moments, such as her heroic rescue of Bill and others during the Earth Rescue Operation, showcasing her bravery and commitment to her friends. Tina has navigator privileges and increases the ship's energy when attacking enemies.

Mighty No. 3: Dynatron, is a robot with electricity based abilities, and the third member of the Mighty Numbers line created by Dr. White.

Heir of the Asakura Clan of the Ten Kingdoms of the East, a master of weapon modification. Using the secret technique inherited from the family, with the help of the power of the "spirit fox", helps the soul troops foresee the threat from the starry sky, thus leading the Earth into a full-scale war preparation mode.

Hèra is the daughter of Helm Hammerhand and a Princess of Rohan during the Third Age.

Yunchi (from Contra Returns) is a descendant of the ancient Star Territory tribe, one of the tribes. Since one of the fires suffered the scourge of genocide, the remaining vein has claimed to be a pedestrian and hid in the protector of the deep mountain temple. Character greeting text

The Shadow Agent was an unnamed woman who infiltrated Tenbi Academy during Minori Rokujou's enrollment.

Girika, a free-spirited Bloodbreed, enjoys traveling to interesting places. She went to Hellsalem's Lot to find unique humans who could threaten her kind. Girika is whimsical and easily bored with agreements or deals if they no longer amuse her.

Ame is the Princess of Armer and a highly skilled cyborg. Having lost her mother at a young age, coupled with the royal responsibilities, she has grown into a composed and reserved individual. Starting mechanical enhancements at six, she became a prodigy. The Armerian adoration for wings has also made her a silent admirer of feathers, causing her to avoid feather products to protect birds.

Mistral, the Guardian Dragon from The Tiger's Apprentice, is a wise and nurturing figure embodying the protective spirit of the Chinese Zodiac. In her human form she retains fierce determination combined with an innate sense of empathy and understanding. Mistral is deeply committed to guiding and mentoring the young protagonist using her wisdom to help him navigate challenges. Her dual nature as both a majestic dragon and compassionate mentor highlights her balance of power and kindness making her an essential ally in journey against dark forces.

As the best warrior of Sky Cloud Star, Valkyrie has never been loved by the clan and has been framed and become a repeat offender; it was originally an action to cleanse herself, but in the end Valkyrie followed her heart and found a partner who could stand by each other's side.

Chrissy, daughter of Team Magma's leader Maxie, embraces her Murian roots and becomes a squad leader in the International Police. Despite her father's extremist views, she strives to protect world natural balance with the help of powerful allies like BladeMan.EXE. With a blend of heritage and newfound purpose, Chrissy stands as a champion of harmony determined to carve her own path.

Diamond Ice is the Noise Card-corrupted form of the Wizard Ice in Mega Man Star Force 3. Jack was able to manipulate Ice's jealousy of Sonia Strumm and Mega Man and use it to transform her, hoping she would eliminate them.

Suzaku, the Eastern Princess from Contra Returns, hails from the enigmatic Suzaku family, known for their mysterious heritage. Following an unforeseen solar storm that altered her very being, she suppressed the Freebase within her, transforming into a formidable warrior. Now, harnessing the mythical power of the Phoenix, Suzaku embodies resilience and fire, ready to rise from the ashes and face any challenge that comes her way.

A scratazon from the Ice Age film series turned into a human.

Belle is a friend and co-worker of Sonia Strumm that was set with her Wizard Ice to be Sonia's drama serial in Mega Man Star Force 3.