Honestly the only fitting skill for a werewolf it's his E.
When i think at him i would like to see a monster on steroids chasing enemies till dead. Wich strong point are AS and MS
Someting like:
Scent of Prey
Passive: Pretty much his actual E .... WW gain true vision and bonus MS over bleeding, Low Hp and Paralized targets
Ripclaw
Q: WW next basic attack deals bonus damage. If the target is an enemy champion or a camp monster, they will also bleed taking additional damage each second for X seconds
Low cd skill, with a stackable over duration effect based on target Current/Max HP
Battle frenzy
W: WW enter in frenzy mode. WW gain a huge boost of speed that decay to a fixed amoun in a very shor time ( Example: From 100 to 20% in 3 sec )
W ( second effect ) If WW hit a champ ( or a camp monster ) before the bonus expire it's duration is extended by "X" second, up to a fixed max value, he will also gain bonus regeneration and AS roids over the duration.
**Pretty much in order to consolidate his identity he will gain more MS, and if he manage to reach his prey he will be rewarded with lasting bonus.
Why no flat heal ? .... Regen it's more fitting and less frustrating over flat heal, this will also prevent lane abuse while preserving his exceptional duelling ability and jungle safness
**
Fury
E ( passive ) : WW will gain bonus AS when continuosly hitting the same unit. After X aa on the same target WW will also deal bonus dmg on each AA
Howl
R: WW throw a massive Howl interrupting ( basically a 0.1 sec stun ) all champions in the area of effect ... the nearest foe it's paralized by fear for a reasonable time ( 1 sec ? )
This it's to preserve the actual ww playstile provviding him a good lvl6 tool for gang combined with the paralize that will trigger the passive effect.