A sample of proposals for anime SI units
Protagonist density: The Tachibana, named after Amagami’s lead, who incidentally has the density of a block of lead. Marked by a general obliviousness, especially when it comes to romance, and a tendency to think with the wrong head.
Incredulity: The Araragi, for Bakemonogatari’s main character and reaction face generator extraordinaire. This could have been named for a good few of Hiroshi Kamiya’s other characters, really.
Moeblobbiness: The Asahina, for Haruhi’s mascot. I don’t think I need to explain how this one works.