She’s a tomboy through and through. As a twelve year old, Runo isn’t your typical pre-teen girl. She loves playing Bakugan with the boys! Runo can be a sore loser and her battling can be inconsistent. She sometimes gets in the way of her team members. Runo has a crush on Dan (although she wouldn’t admit it) and is jealous of Julie. In battle she uses light attributes.

Runo is always arguing with Dan since they are rivals. She has a close bond with her Guardian Bakugan, Haos Tigrerra, who is very obedient to her and powerful in battle. Tigrerra later evolves in to Blade Tigrerra. One of the things she hates the most is when people believe they're better at brawling then her, just because she is a girl. She loses a lot of her Bakugan to the Doom Dimension, to a point were she almost quit the game, but she then decided not to. She has met Keith/Spectra, Gus, Mylene, Lync, and Shadow Prove of the Vexos.

Her outfit in the original series is a white/yellow shirt and a white skirt where her midriff can be seen. Her outfit in New Vestroia is a white/yellow dress.

She helps her parents run their family business, and when Alice comes to visit, she helps Runo's family with their restaurant, which leads to Runo becoming jealous as boys came just to see her. But after she comes home from the Doom Dimension a group of boys are happy to see her. She has a crush on Dan, but won't admit it. Even so, when Dan is acting inappropriately, Runo does not hesitate to take out her anger on him. She reached 4th in the rankings.

In Bakugan Battle Brawlers: New Vestroia episode 1, she sees Drago, but is left behind along with Julie when Drago tricks them into turning around while he and Dan went to New Vestroia. Runo gets angrier and angrier by the day as Dan never returns. So in episode 10, "Surprise Visitor," she blows it and heads over to Moscow with Julie to meet up with Alice and go through the gate to New Vestroia. Although she did so, the process was incomplete, sending Runo to New Vestroia, but leaving her without a physical body. When Dan, Runo, Baron and Mira go through the portal to Earth, Spectra, Gus and Lync follow them. Spectra proceeds to kidnap Runo, only to give her back to Dan, having kidnapped her to make Dan follow him. After Dan and the other's learn the Dimensional Transporter needed to be fixed, Runo and Julie accompined Dan, Mira, and Baron to back to their home. During the time Dan was back he and Runo showed how much they matured from the last series as they didn't fight that much but when they did they would end up laughing in the end. She gets ready to go back to New Vestroia with Dan in episode 19, but then has to stay on Earth as she needed a Gauntlet in order to go through Dr.Micheal's dimensional transporter. She gets really upset by this but Dan promises he'll be back. At the the end of of season 1 she got Blade Tigrerra back. When the Resistance became stranded on earth, Baron once teased her about her baby pictures all over her parent's resturaunt. However, she gets even by dragging Baron by the ear and stuffing him in the trash.

Bakugan: Gundalian Invaders:

In episode 7, Runo is seen in a flashback.

In episode 22, she was shown in a picture along with Dan and Julie.

(Source: bakugan.com)