Varus
Varus mid is viable right now, but his kit is still pretty bad in that you always end up giving up half of it. If you play him Q poke, you don't auto and make no use of your W's passive. If you play him ADC, using spells interrupts your DPS which is a problem lategame, so you make no use of your W's detonation. Solution:
- move part of Q's ratio to AP
- add an AD ratio to W's detonation as flat damage instead of percent max health
- make Q's on-hit become an auto attack modifier so it can crit
- make E's casting time be reduced by attack speed
- make Q's charging time exponential, with a much faster midrange and a slower max range.