Hey there Fennec, super nice to have you here! I'm absolutely canonblind, and probably way too excited for Ciel here.
Anyway, I'm Celen and I play Bucky here from the MCU canon, Stiles from Teen Wolf, Jamie Moriarty from Elementary and Constance Bonacieux from BBC's The Musketeers! Nearly all of mine have interesting CR with Sebastian: him and Stiles have a mutual hate-hate relationship going on, Sebastian and Jamie should probably form a Smiling Murderers Association and Constance, god knows why, actually likes Sebastian. Probably because he's a very effective co-worker.
So you can see why I'm thrilled to get to throw all my characters at Ciel! I look forward to his intro, and I hope you enjoy the game! Also, going to join the train of adding you on plurk, I hope that's okay!