Makoto Kobayashi holds the distinction of being the second-shortest student at his high school, surpassed only by Atsumi Miyagawa. This height difference defines his primary interaction with her; despite his own notably short stature, he regularly mocks her height, often triggering retaliatory jabs from Atsumi.

He maintains a friendship with classmate Yoshioka, who openly voices a lolicon fetish and labels Atsumi a "legal loli." Makoto typically counters Yoshioka's behavior and related predicaments with sharp sarcasm. Their dynamic, particularly as Yoshioka's fixation on Atsumi escalates, fuels recurring comedic situations.

Physically, Makoto possesses black hair and black eyes consistent with his Japanese nationality. His role gains prominence in the third season, where his interactions with Atsumi and Yoshioka intensify, shifting a significant portion of the series' comedic focus onto Atsumi's experiences.