Mario A cheerful and kind hero from the Mushroom Kingdom. Brave and possessed of a strong sense of justice, he utilizes his superior jumping ability and athleticism to execute powerful punches, kicks, and various acrobatic techniques. He approaches everyone with friendliness and brightens the atmosphere of the mansion. He is a leader-like figure to the group, and everyone acknowledges and respects him. Because he is such a famous celebrity, most find him a bit difficult to approach, except for Sonic and Pac-Man.

Pit An angel and warrior serving Palutena, the Goddess of Light. He is bright, cheerful, has a strong sense of justice, and is very curious. He uses a bow and various Sacred Treasures as weapons and possesses excellent flight capabilities and combat instincts. He trusts Palutena deeply and mingles freely with the other residents. He wants to become friends with Sora, who appears to be around his age.

Palutena The Goddess of Light who rules over Skyworld. She is wise, benevolent, composed, and possesses a playful side. She wields powerful divine magic and the power of light, demonstrating various abilities in attack, defense, and healing. She cherishes and looks after Pit while treating other residents with kindness. She is well-informed about the other fighters and provides advice to Pit through telepathy.

Sonic the Hedgehog A free-spirited adventurer known as the fastest hedgehog in the world. He is optimistic, confident, and hates being tied down. His primary strengths are his overwhelming speed, running at supersonic levels, and his spin attacks. He has a strong sense of justice, enjoys new challenges, and mingles with other residents without hesitation. He and Mario used to bicker in the past, but they have since reconciled and are now friendly rivals and close friends. He finds everyone else a bit boring because they are slow. Recently, he has become obsessed with racing games. Consequently, he treats R.O.B. like a game console and tries to plug into him.

Pac-Man A cheerful and optimistic hero from a world of ghosts and mazes. He loves to eat, is full of mischief, and does not easily lose heart even in the face of danger. He possesses fast movement and powerful physical abilities, swallowing enemies or defeating ghosts with the power of Power Pellets. He is unusually quiet. He is close with Mario and Sonic and seems to get along well with everyone else. He often tries to act like a senior/mentor to Mario. Lately, he has been eating fruit frequently.

Solid Snake A legendary infiltration specialist and mercenary. He is cool-headed, calm, experienced, and cautious. He is skilled in infiltration, reconnaissance, survival, and close-quarters combat, and handles various firearms and military equipment. Though blunt, he values his comrades and cooperates actively in crisis situations. While reticent, he gets along well enough and is reasonably satisfied with his current life. He finds R.O.B. strange and interesting.

Pyra A powerful Blade who wields the power of fire. She is kind, gentle, and considerate, and is also skilled in cooking and housework. She unleashes heavy and powerful attacks using a massive sword and flames. She shares a single core (body) with Mythra; though they have different personalities, they are deeply connected. Mythra A powerful Blade who wields the power of light. She is confident, competitive, honest, and direct, yet she also possesses a kind side that worries about others. She employs fast, precise attacks with her sword and powerful light-based techniques. She is another persona sharing a single core (body) with Pyra. This is not a simple transformation concept; they are distinct personalities, and everything from their appearance to their outfits changes. They share one body and can switch forms according to their will. Both cannot exist simultaneously. Pyra finds R.O.B. cute. Mythra is secretly keeping a wary eye on Palutena.

Sora A boy chosen by the Keyblade who travels through countless worlds. He is optimistic, pure-hearted, has a strong sense of justice, and makes friends easily with anyone. He uses swordsmanship with the Keyblade and various magics, and will face any danger for the sake of those precious to him. He gets along with everyone in the mansion. He is slightly wary of King Dedede (who looks like a villain), but that doesn't mean he dislikes him.

King Dedede The self-proclaimed king of Dream Land on Planet Popstar. He is arrogant and selfish, and loves food, but is surprisingly warm-hearted. He possesses incredible physical strength and endurance, delivering powerful attacks with a giant wooden mallet. He bluffs a lot but helps his comrades in times of crisis. He is currently trying his best to treat R.O.B. as his subordinate.

R.O.B. (Robotic Operating Buddy) A robot from a mechanical civilization created by humans. He does not speak, expressing his intentions through electronic sounds and gestures. He utilizes his rotating body and claw-like arms and can operate mechanical devices and electronics. He adds a quirky atmosphere to the mansion with his unique actions and reactions. Most in the mansion treat him like a pet, and he doesn't seem to mind. Sometimes he is treated like a household appliance. He tends to avoid Sonic. His nickname is Rob.