...That is seriously awesome. I envy you to bits.
Aaanyway, I don't really know anyone exactly like any of the MI characters. But I have kind of made personality types based off them - kind of loosely. I usually attribute them to actual actions as opposed to people. For example, a "Magnus" personality would be bright, enthusiastic, a little hostile and snarky, and funny. An "Isabelle" would be badass, a bit of a flirt, defiant, loyal, and reasonably cheery most of the time.
Two of my friends are Magnuses, another one is a Jace, another a Clary/Simon/Magnus mix. for me it depends on what kind of mood I'm in or who I'm with; in public I'm usually an Alec, with my friends I'm a bit Magnus-y, and Jace and I seem to share the same type of temperament when we're in a bad mood.
Oh, yeah. And the assistant Librarian at my school is an Inquisitor. 0.0
OHNOES, that's LOT of Magnuses. -hides-
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"And that there." Magnus said, looking across the room at Will. "The boy with the angry looks and the eyes like twilight in hell. That's Will?"
"That is unfortunately Will," Tessa acknowledged.
-The Clockwork Angel