Yuma's responsible older sister who works as a journalist.
- Cool Big Sis: An odd example, seeing as she actually is the protagonist's big sister. Yuma is the first protagonist in the franchise to even have a sibling.
- Cool Bike: An old, gas-engine motorcycle. Inherited from her father.
- Cool Car: Drives one in episode 3. Much like the bike, it was inherited from her father.
- Intrepid Reporter: She'll take any risks she has to in order get the latest news; doesn't always work.
- Tsundere: Towards Charlie.
- Unresolved Sexual Tension: With Charlie. She lets him kiss her, but she always slaps him afterwards.
Yuma and Akari's mother.
The father of Yuma and Akari.
- Anime Hair: Without his hat, you clearly see from whom Yuma got his crazy hair.
- Cut the Safety Rope: Does this to save Mirai in a flashback in Episode 19, when he is dangling over the edge of a precipice with only her holding him up. He survives, winding up in the Astral World, where a figure resembling Astral gives him the Emperor's Key and shows him a vision of the Astral World being attacked.
- Disappeared Dad: Disappeared at the same time as Byron, due to Faker's actions, but hasn't resurfaced like Byron did as Tron.
- Horrible Judge of Character: Kazuma agreed to work with Faker because he wasn't looking to use the interdimensional portals for money, fame, or power.
- Mysterious Parent: The root of many of the events in the series. Lampshaded in a conversation with Astral, when the latter ask "did your plan work out how you intended?". He claims he's not sure himself.
- Nice Hat: He wears a hat for most of the time. It hides the reddish-pink bangs he has.
- Spanner in the Works: As Eliphas reveals to Yuma, him coming to Astral World drastically ruined the plans of Astral World and Eliphas, with Kazuma altering Astral's programming and sending him to Yuma.
- The Power of Friendship: He is the source of Yuma's kattobingu.
- Miniature Senior Citizens: How she's portrayed.
- Almighty Janitor: Literally. Obots are designed to clean up trash, but Obomi is smarter and more skilled than most of them.
- Babies Ever After: With Orbital 7. How this is possible we'll never know.
- Because You Were Nice to Me: She was originally owned by a thief but Yuma's kindness made her do a HeelFace Turn.
- Deadpan Snarker: Even more so in the dub version.
- Defictionalization: Of a sort, she has her own card.
- Funny Robot: Unfortunately, most of her humor is at Yuma's expense.
- Robot Buddy: Towards Yuma and his friends.
- Tsundere: As much as a robot can be considered tsundere, but she constantly calls Yuma an idiot even while being kind and serving him food. She is also the Defrosting Ice Queen version towards Orbital 7.Obomi: Yuma sucks and is a mega idiot. But he is kind.
- What Measure Is a Non-Human?: Considering the things Yuma was willing to do for her...