Moments of anger and distress sparked by some outside force do not make her edgy. Her natural disposition is to be nice.
ryuko being edgy was just a meme from the start of the ironic-shitposting age of /v/
Does this look like an edgy girl to you?
She;s literally the edgiest anime character in existence. Look at this gif.
>meme from the start of the ironic-shitposting age of /v/
Also, while Ryuko is the best KLK waifu, Nonon is the supremely best sexual girl from the series.
I masturbated to her 98 times - more than to any other girl - ever since KLK came out.