AzazelGrim
Will you mane an auxiliar chapter in the future with all OC's including NPC's? I read that you won't have the MC join Ainz Ooal Gown... so I just wanted to remind you that most people that read fanfiction, do to read about existing characters, and if every character is an OC, you are better off making an original fic, not a fanfic. I myself like the idea of MC making a Guild, but that means having a ton of OC, including both Guildmates and NPC's.
You could make Meimei the shadow monarch, a new hidden class, which whould basically be like the shadow monarch but more limited, like only could have 10 shadows of something like that. it would match her type of assassin, shadow user and stalker, to have her shadows always seeing everyone and being able to see through them and teleport between them. She would also have her private assassination squad to protect Lucian.