Boku (僕) Wataru (渉) Tori (桃李)
Often adds prefixes like "Adorable" or "Beloved"
Yuzuru (弓弦) Hidaka-kun (氷鷹くん)
Hokuto (北斗)
Subaru-kun (スバルくん)
Akehoshi-kun (明星くん)
Makoto-kun (真くん) Isara-kun (衣更くん) (pre-Requeim)
Mao (真緒) (post-Requiem)
  
Eichi (英智) Watashi (私)
Watashi-tachi (私たち)
Anata (あなた)
Princess/Himegimi (姫君) Butler-san (執事さん) Hokuto-kun (北斗くん) Barubaru (バルバル)
Subaru-kun (スバルくん)
Yuuki-kun (遊木くん) Mr. Jack-of-all-Trades (『器用貧乏』くん)
  
Eichi-sama (英智さま) (! era spring-summer)
Prez/President (会長)
Long Locks/Long Hair (ロン毛)
Hibiki-senpai (日々樹センパイ) (infrequently, only when he's being nice, and !! era)
Boku (僕) Yuzuru (弓弦) Hidaka-senpai (氷鷹先輩) Akehoshi-senpai (明星センパイ) Glasses-wearing monkey (メガネザル) (! era)
Yuuki-senpai (遊木センパイ) (!! era)
Saru/Monkey (サル)
Isara-senpai (衣更先輩)
New Prez (新会長) (!! era)
  
President-sama (会長さま) (pre-EP:Link)
Eichi-sama (英智さま) (post-EP:Link)
Hibiki-sama (日々樹さま) Bocchama/Young Master (坊ちゃま) Watakushi (わたくし)
Ore (俺) (past)
Hidaka-sama (氷鷹さま) Akehoshi-sama (明星さま) Yuuki-sama (遊木さま) Isara-sama (衣更さま)
The new President (新会長さま) (!! era)