The thought had crossed my mind a couple of times. Of Patchy resembling Yue, the do kind of look and act similar in some ways. Same thing with Remi resembling Evangeline, they're both pretty charismatic and vampires. But I always wrote it off as a strange coincidence...
quoting wiki, "Patchouli has been rumored to be the inspiration for the character Yue Ayase from the manga Negima! Magister Negi Magi. Like Patchouli, Yue is a short, quiet girl with long purple hair, an unexcitable personality, an affinity for books (she is a librarian) and magic (she is also known to dress in a witch outfit similar to Marisa's)."