Let's pretend we have a new player. Eager and excited to join the game. Tell stories. Have adventures. Maybe this kind of game is new to them or they have a style that is very different than most Sindome players have adopted. Maybe they go through a handful of characters as they try and learn the game and people think they see similarities between them.
This can happen. Has happened. I just want to urge people to maybe consider how their characters react to this ICly. Maybe don't flirt with the 4th wall to bring your OOC assumption that these are all the characters of the same player into the IC world. Maybe don't bully them ICly to a degree beyond what you see done to other characters. Maybe try and help them understand the game better in a way less likely to scare them off.
Personally, I don't think this kind of thing is in the spirit of cooperative competition and is borderline meta. And while PCs should not get a blanket free pass, this kind of behavior runs the risk of making the player feel unwelcome. Maybe that excitement and enthusiasm gets knocked off them and they leave the game. Maybe I just have to sit here and frown at what comes across to me as OOC criticism dressed up as IC scorn being thrown at these characters/players.
Everyone should play how they want as long as they aren't breaking any @rules. If this is how you like to play and staff sees no issue with it, so be it. I just hope that some will consider this angle is all.