I got so bored today I decided to look up the number of players playing each character and figure out which characters were most common in Ranked matches.
This is based on the number of Vita players who have reached 50 PSR or more with a character - it doesn't take long to get there, but it shows that there's at least some level of repetition and dedication, as opposed to "Oh yeah I played around with them a couple times online".
Now you know that it really isn't your imagination - there really is an absurdly high frequency of Ragnas. This doesn't change too much as the cutoff point becomes higher, either (The only really significant difference is that there is a sudden swap between Hazama and Noel; everything else is maybe one spot in either direction)
[An honorary Vassal of the Lord Laharl] The best rating is your own. I don't base my choice on other peoples views - Samus1