Odasaku (小田作 - oda-saku) - variation of Oda Sakunosuke's name in
manga Bungou Stray
Dogs. Only Osamu Dazai used to call him like that.
In BSD
fandom, a lot of sad Oda-stans (Oda's fans) say "Odasaku" instead of his actual name. Kinda cute.
Dazai's quotes about Odasaku: