Tatsuya Kida

Tatsuya Kida (木田達也) is a major character in Mars and the main character in Mars: Horse With No Name. Tatsuya is Rei's best friend, and Harumi Sugihara's boyfriend. Compared to Rei, he is more level-headed and less likely to make impulsive decisions. Tatsuya is also fairly introspective, and like Rei, is good at basketball.

Biography
Tatsuya attended the same middle school as Kira, and had a crush on her. One time in middle school Tatsuya accidentally grazed her hand, causing her to pull it back in disgust. Tatsuya first met Rei in high school: the two at first did not get along, with Tatsuya particularly not liking how Rei could talk to Kira but he couldn't. After Tatsuya recovered Rei's bracelet and Rei saved Tatsuya from a group of bikers, the two became friends. After Rei and Kira met, Tatsuya, still harboring feelings for Kira, was suspicious of Rei's intentions with Kira, especially since he had a reputation of a womanizer. After Rei unsuccessfully attempted to set Tatsuya and Kira up together, Tatsuya got over his feelings for Kira and ended up getting with their friend Harumi Sugihara. Near the end of the manga, Tatsuya began riding motorcycles like Rei.

Rei Kashino
Rei and Tatsuya are best friends. Rei and Tatsuya sometimes have squabbles, especially early on when Tatsuya fears what Rei's intentions with Kira are, but Rei feels he can rely on Tatsuya when he needs to. Rei, will come to Tatsuya's aid if he is in danger.

Kira Aso
Kira and Tatsuya are friends, and Kira asks him for advice, mostly about Rei. Tatsuya had a crush on Kira in middle school, but due to her trauma and aversion to men in general, she did not notice. Before he and Kira started dating, Rei tried to set her and Tatsuya up.

Harumi Sugihara
Tatsuya and Harumi are boyfriend and girlfriend. They are close, and sometimes go on double dates with Kira and Rei.

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