Okay, as far as master relations I was thinking something like this for Mercedes?
@Duoya If Daisuke hold such potential for familiars and was left to his own devices, the Clocktower may be keeping an eye on him to make sure he doesn't manifest the power to summon servants at will? In that case Mercedes would at the very least know of him.
@heroic2019 Of course she would know of the famous Sekimoto Family. Enforcers surely would want the best of the best mystic codes for their work, perhaps Mercedes' cloak was even commissioned to her? Or at the very least from her department. Mercedes would probably frequent the department, and they may be passing acquaintances that trade banter every now and then.
@KoL Alex's views on mage society are similar to Mercedes' own, and Mercedes is rather fond of younger people and if they ever bumped into each other while they were both at the Clock Tower, I'm sure Mercedes would have struck up a conversation with her, probably on multiple occasions. Alex probably reminds Mercedes of her own younger sister (something I left off the CS because it wasn't relevant and I didn't want to go over the 2 paragraph limit). And then if finding out her true age, well, they might have become friends.
@Reflection Vlad being a regular staff member at Clocktower, Mercedes might have seen him around when she returns to it. She would most likely be very interested in his family history and his golem research, since it seems so pure hearted. She probably would have tried to make conversation with him.
Also people can feel free to PM or message me on discord for deeper planning or anything like that I am very receptive and like to tell a story through RP, I'm not worried about Mercedes winning or anything, if it happens it happens :P