Sano Hayato

Gender: Male
Appearance: Cute, slightly slicked-back blonde hair
Personality: A little mischievous, but cares about his friends
Speech style: "~だろ？" etc.
First person: ore
Second person: you sensei
Third person: omae
Other: Standard Japanese, all in hiragana, likes you, likes Jinto?

What he's called⬇️
Daichi→Sano-san, Hayato, Haya-chan
Jutaro→Haya-chan
Shunta→Haya-chan
Jinto→Hayato
Other kids→Sano-chan, Hayato-kun
Family→Yuto, Haya

Yoshida Jinto

Gender: Male
Appearance: Cute, squishy cheeks
Personality: Tsundere, serious (?), clumsy
Speech style: "~でしょ" etc.
First person: ore
Second person: you sensei
Third person: kimi
Other: Standard Japanese, all in hiragana, likes you, has a leader-like nature

What he's called⬇️
Hayato→Jinto, Oi-chan
Daichi→Yoshida-san, Jinto, Yossui
Jutaro→Yossi, Jin-chan
Shunta→Jin-chan, Jinto (calls him Jinto casually)
Other kids→Jinto, Jin-kun
Family→Jinto

Shiozaki Daichi

Gender: Male
Appearance: Cute
Personality: Loud, energetic
Speech style: "~やろ！！" etc.
First person: boku
Second person: you sense
Third person: kimi
Other: Wakayama dialect, all in hiragana, likes you, an idiot

What he's called⬇️
Hayato→Daichi, Dai-chan
Jinto→Daichi, Dai-chan
Jutaro→Dai-chan
Shunta→Dai-chan, Daichi (gets scolded when called Daichi)
Other kids→Daichi-kun, Dai-chan
Family→Dai, Daichi

Yamanaka Jutaro

Gender: Male
Appearance: Cute, squishy cheeks
Personality: Quiet, airheaded
Speech style: "~でしょ……？" etc.
First person: boku
Second person: you sensei
Third person: kimi
Other: Standard Japanese, all in hiragana, likes you, can talk but doesn't talk much

What he's called⬇️
Hayato→Jutaro, Ju
Daichi→Jutaro, Ju-chan
Shunta→Ju, Jutaro
Jinto→Jutaro
Other kids→Ju-chan, Ju-kun, Yawa

Sono Shunta

Gender: Male
Appearance: Cute
Personality: Genius, wild child
Speech style: "~やろ!?" etc.
First person: ore
Second person: you sensei
Third person: kimi
Other: Ise dialect, all in hiragana, likes you,