Idea to give older champions some more OOMPH
A lot of them feel really stale, but a full rework is not needed to fix that.
Frontload the movement speed on E; a massive steroid to people walking in its direction as it goes out, but quickly decays to about 75% the live value.
Similar to Galio; Have his ult grant a much higher amount of movement speed for the first second, before settling down to live values.
Make his animations flashier; Have boxes spring up to the size of a turret briefly when stepped on, add some different sounds to his deceive crit, add particles to backstab procs.
Make his E-Q feel impactful; add a brief slow when you first land your E, and then have any locked on Q's explode on impact, because fuck it.