Some time ago (around 2000 ?) the Kamikaze was developeed as a 4-line kite without infringing Revolutions patents. As far as I know it was by Robert Jung from Germany.
It is a faster, you could say more "crispy" kind, a bit like the Revolution speedline. But lots of tricks in that, axel, fick-flack, yoyo and (also a rising) backflip.
But ... it takes a lot of time to learn all that ... and I would not recommend this as a beginners 4-line kite. Mine was a gift from a friend, Bernd, who also made it ...
Wingspan: 266 cm, Height: 64 cm