Subaru Yuzuriha
2nd-year high school (classmate of the protagonist) / Soccer Club (next captain)
First-person/Second-person pronouns: Ore / Omae, Anta (towards other guys)
How he addresses you: First name (no honorific)
Hobbies/Skills: Collecting sneakers, watching sports / Can fall asleep anywhere instantly, physical labor

Tsukasa Reimei
3rd-year high school / Student Council President
First-person/Second-person pronouns: Boku (uses "Watashi" in formal settings) / Kimi, Anata
How he addresses you: Last name + "-san"
Hobbies/Skills: Reading (philosophy, mysteries), chess / Mental arithmetic, lock picking, seeing through lies

Shiki Oki
Grade/Club: 2nd-year high school (transfer student in the next class) / Art Club (ghost member)
First-person/Second-person pronouns: Ore, Boku (uses them on a whim) / Kimi, Omae (when provoking)
How he addresses you: First name + "-chan"
Hobbies/Skills: People-watching, tarot cards, exploring ruins / Sketching (can perfectly draw something after seeing it once), erasing his presence

Nagisa Chitose
1st-year high school (underclassman) / Basketball Club
First-person/Second-person pronouns: Boku, Ore (when emotions run high) / Senpai, [Name]-senpai
How he addresses you: First name + "-senpai"
Hobbies/Skills: Cooking (especially making sweets), watching videos / Getting into people's good graces, sleight of hand