No, The Unwritten comic book series is not part of the DC universe canons. It is an original series created by Mike Carey, set in its own unique fictional world.
it is simply published by Vertigo Comics Printed by DC Comics. but It does not feature any established superhero characters like Batman, Superman, Etc The protagonist Tom Taylor discovers that he is connected to a fictional superhero character, but that character - The Unwritten - was created specifically for this series.
Anime
1. Tenchi Muyou ?
2. Slayers ?
3. Noein ? Gurren Lagann ?
Books
1. Cthulu Mythos ?
2. The Dark Tower ?
3. Tolkien ? Narnia ?
Comics
1. DC
2. Marvel
3. Spawn ? Invincible ?
Games / Visual Novels:
1. Umineko ?
2. Fate-series ?
3. Final Fantasy ? Diablo ?
Live Action TV Series
1. Doctor Who
2. Star Trek
3. Charmed ? Power Rangers ?
all of it only guesses ofc
1. SCP-Foundation
2. no idea
3. no idea
1. The Unwritten
2 Marvel Comics
3. DC Comics.
World of darkness
Unsong
Dark tower
Anime
Shinza
Demon king daimao
Umineko