It doesn't really matter I suppose, though the purpose of this thread is finding out who's actually the popular one.
Unnecessary? probably. Fun to find out? yes.
Unnecessary? probably. Fun to find out? yes.
You should check out Wario Ware art on Pixiv, it's a Japanese art sharing site. It coincidentally has just enough Mona pictures there too. She may not be the most popular but she does have a nice following of Japanese fans and even western fans too. I'd say she's still significantly popular enough.