Honestly, I think that they both have a lot of personality.

Out of these two, Matsuda. I don't like Misa, but one thing I could never accuse her of is being plain. Just really, really annoying. Matsuda is a far superior character, just not as vivid, which isn't necessarily a bad thing.

Actually, she is plain. Isn't like most of all models are blonde? It's like brunettes, ravens, and gingers have no reason or just don't get lucky much in the modeling business. It's always blondes. Everywhere. Hello, Barbie being the biggest distrusted model in the world. With over thousands of styles to choose from. Now if Barbie where chosen to be brunette instead of blonde, everything would've been brunette instead of blonde. Because they tend to look back. Blondes have that, all of them. Of false cuteness and unawareness. And that's mostly shallow, enough for them to always be accepted in anything so easily. It's like they all sold their soul to Satan. Normally it takes a bit more potential to be a good character. And Matsuda had character. He is viewed as plaon for not having style, what? Really? Plain to me is, to not have any character nor potential.

Neither of them are plain

Neither.