So, this book is new (obviously) but I'm gonna tell you some of the characters you can expect to make an appearance

Maxis
Kyle (Cfan23 )
Random
Isaac
Zerlic
Zoey
Mr. Bruce (a teddy bear)
Gracie
Felix
Samantha
Mizuki
Michael
My face
Charlotte
Henrey
Bnha characters
SAO characters
AOT characters
Harry Potter characters
Overwatch characters
Syrus
Thomas
Ink
Owl

And that's all I can think of, if I add more, I'll tell you.