-Hard to lock down
-Has a cc reduction passive (or ability)
-Slows when takes damage (but slows last shorter then normal)
-Has a speed or mobility causing ability (some kind of ability that lets him/her refresh his/her mobility somehow, like Evelyn w or even Ahri ult)
-Has a low damaging kite ability with reset
-Small cc causing ability for disengage (or even more mobility for tricks, could be intractable with other champs and/or his/her ult)
-His/Her ult would be a huge cc nuke that lets him/her kite even more freely yet has a second delayed effect that ends his/her advantage (think how zyra's ult is in two stages) giving him/her a small window to perform his/her actions...
This is really a champion "concept" and because I don't have a team of trained developers with me what I came up with is this thing... whatever it is.
I feel that this kind of champ would be really fun