Ekko
Z-Drive Resonance (Passive) the slow and the movement speed buff are now two separate values
AP Ratio increased to .8 from .7
Slow reduced to 30/40/50/60% at level 1/6/11/16 from 40/50/60/70/80% at 1/6/11/16/18
Movement speed buff changed to 40/50/60/80% at level 1/6/11/16 from 40/50/60/70/80% at level 1/6/11/16/18
Parallel Convergence (W) shield value changed to 80/100/120/140/160 (1.5 AP) from 150/195/240/285/330 (.8 AP)
Chronobreak (R) heal reduced to 20% of damage taken over last 4 seconds from 20/25/30%
Chronobreak (R) heal AP ratio increased to "(0.066 AP)% [so 6.66% per 100 AP] of the damage taken over the last 4 seconds" from "(0.033 AP)% [so 3.33% per 100 AP]of the damage taken over the last 4 seconds.
That's the changes to him that are listed on Surrender at 20. Bit of a nerf to his passive's slow and move speed buff, an increase to his shield's scaling and a reduction to the base, and his ult's base heal doesn't scale with rank anymore, but they doubled the heal's ratio.