Prime opportunity for marketing!
I like the King Rammus skin for it's reference to Bowser, but it has long since been made a legacy skin for legal reasons I'm guessing. However, I always thought it was a prime opportunity missed to be a Sonic skin instead. Enter the modern day Paramount Sonic movie; with how big league has become, maybe a lucrative deal could be done to have a legendary Sonic Rammus skin, and maybe an ultimate supersonic skin? Seems like lots of free advertising, money from skin sales, and fan service to be had all around.