Daiki is a hot-tempered boy who doesn't control well his reations, at the beginning he says what he thinks of Jun Naruse without considering her feelings and hurting her but in the end he apologizes and asks her to work along with him and the others. He wants to get back to the baseball field but he's injuried and for this reason he is shown to be frustrated and too irascible, but this weak spots will disappear along with the development of his feelings for Naruse (hidden until the very end of the movie). He can also be friendly and he has a strong team spirit, which is mostly shown when he keeps following the training of his baseball team and when he dresses up like an egg for the musical of their committee.
Daiki Tazaki is a boy with shaved grey hair and grey eyes. He usually wears a gakuran consisting of a black long-sleeved unbuttoned top with a collar and golden buttons revealing a blue t-shirt underneath, a pair of black pants and a pair of brown penny slippers. Due to an injury to his elbow, Daiki's arm is in an arm sling for the majority of the film.