Following
http://www.mangago.zone/read-manga/ore_to_joushi_no_kakushikoto/
or
http://www.mangago.zone/read-manga/the_next_door_neighbor/?av=1
Sorry can't really remember if it's either of these but I remember some character or something in them
It's not either of these but thank you for trying to help!
I guess it's this oneヾ(❀╹◡╹)ﾉ~
http://www.mangago.zone/read-manga/uchi_no_tenshi_ga_kemono_deshita/
Ah yes that's the one! Thank you so much! ^^
No problem (●'◡'●)ﾉ
It's a yaoi about a manga author who asks for help and discovers a person who looks exactly like his character, he thinks his character came to life. The character is a girl but the person is a guy. I think maybe the guy had blonde hair? Also the characters rival (i think she was called Milk-chan?) shows up also as a irl guy. I think milk chan had white hair