Runo Misaki is a tomboy, who is not your typical pre-teen girl. She loves playing Bakugan with the boys. Runo is always arguing with Dan since they are rivals. She has a close bond with her Guardian Bakugan, HaosTigrerra, who is very obedient to her and powerful in battle. Tigrerra later evolves into 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 where she almost quit the game, but she then decided not to.
Runo is arguably the most headstrong heroines in the four series of Bakugan, as she always wants to have her own way in everything, wants attention from boys, often attacks head-on before carefully judging the situation. She is also very proud and is eager to going her own way.
She loves Dan , that is undeniably, and their love is greatly supported by the authors of the plot. Runo was made to be the "tsundere" girl who never admits her love, outwardly because of pride but deep inside, because of shyness. But, because Runo possesses a rather childish personality, her actions seem to tend toward having Dan for her own.
Despite having certain, undeniable flaws, Runo is shown to be a caring, kind and cute girl, always tries her very best in everything and never slow to help her friends. As time passes between the seasons, she seems to have been more mature.