I had a question about a character I'm thinking of apping. The character's kind of unique so...yeah.

Basically the character is Kyubey from Mahou Magica and his job is to contract young girls to become magical girls. The girls gain assorted magical powers and outfits to match. The girls then fight entities called witches which are invisible manifestations of despair and grief. They cause shit like suicides and stuff. The implication is that witches appear wherever there are humans because humans naturally will have feelings of despair and so on etc.

So basically I'm wondering:

Would he be able to contract people at Sing? AKA grant people new or extra magic powers? Obviously it would be the kind of thing organized between muns. The contract involves him granting a wish, so obviously this would have to be limited--he couldn't exactly send people home or anything.
Would there be witches for these magical girls to fight? Usually they're invisible to most people but that can be handwaved. Witches can also be sort of event-worthy type things or like "man that one area of the station just seems kinda unpleasant lately" or something.

A lot of this can be tweaked and such but basically I'm just wondering if it would even be possible to swing this.