>>82230653
OG tsukihime was interesting especially ciel and akiha routes, kohaku and hisui (maid routes) were mostly 1:1 but still revealed some stuff about the tohno family.
I get what you mean when talking about nasuverse spin offs, most are money grabs or arent even done by nasu + its mostly slop. Grand Order was created as money grab and the story is pretty meh with exceptions of LBs (from what i have heard). Most of hollow ataraxia is just slice of life in main fate universe. If you want to read a good spi noff series with good art i would recommend fate/type redline, its very good and i really like oda nobunaga.