Someone should remove those godforsaken crossguard blades from Ren’s lightsaber. Also, as an added bonus, change the blade colour to something other than red (Dark green would be nice.).
Having now seen the movie, I can say – with 100.100% certainty – that I still stand by this.
Oh, except for one difference: Ren’s lightsaber would look better purple than green. I think this shade would do nicely