My thoughts on Evil Ryu:
B+hp is a great anti-air attack, so good that it can catch Chun Li’s j.lk clean. It can also stuff a lot of special moves, like psycho crushers and sumo headbutts.
B+hk will hit attacks that go on top of Evil Ryu’s head.
I also like b+mk for catching some special moves, like blanka balls and scissor kicks. Neutral mk is Evil Ryu’s best normals for catching Buffalo Headbutt.
C.mp is excellent and can catch moves other normals won’t. But if you’re playing a shoto, you knew that already.
C.mk has great range. Learn to alternate low kicks so you can control the distance between you and the opponent after a blocked combo. C.mk xx lk tatsu xx throw is also pretty fun.
C.hk into hadoken is especially handy for the distance it builds. I feel like the distance after that is the perfect distance for Evil Ryu to attack.
Besides f+mk, f+mp makes for a great overhead. Both can lead to sweep (example: f+mk, c.mp, c.hk on crouching opponents), and cancelling that sweep to other special moves lead to other setups.
You must learn to use these normals because of the lack of invulnerability on DPs. Wakeup DP loses if the opponent tries their own invulnerable move. Note that there is no damage difference between Evil Ryu and U.Ryu’s shoryuken.
Like USF4, Evil Ryu’s teleport is slow and easy to hit even if you try a read. It’s better to use Raging Demon to set up combos, like LiangHiuBBB demonstrates in his video.
Evil Ryu can time a meaty fireball to force the opponent to block three hadokens, just like U.Ryu. This is a big deal because Evil Ryu needs all the damage he can get to open the opponent up.
Evil Ryu’s easiest kill combo is j.hk, c.mk xx mk tatsu xx shoryuken (dizzy) short teleport, c.mk xx mk tatsu xx shoryuken. This is the easiest 100% combo in the game and the j.hk can come from either side. You won’t be able to fool opponents with this twice though so you’ll have to learn other ways to deal damage to be more consistent.
Air tatsu is not gimmicky. Learning when to sneak those in and what strength to use to chain more together is essential to leveling up.
I also think Evil Ryu is one of Violent Ken’s worst matches. It creates an interesting dynamic where Violent Ken beats Akuma, while Evil Ryu beats Violent Ken. I’m not too sure about Evil Ryu vs. Akuma though. I think a more disciplined Evil Ryu player can make that match even, but I get salty way too easily.
Landing Raging demon is worth losing shinkuu hadoken, and works best if your opponent is stuck guessing high-low. Or if you can get in one of the setups from the combo videos posted all over the Internet.
That’s all I got. ¯_(ツ)_/¯