In my opionion Stryker is underrated player.
I want to believe this but having played him extensively he is in my opinion the worst character in the game, he has virtually nothing redeeming aside from a decent (not fantastic) zoning game. Gunshot is a great move, but cancel is too slow unless you're mind reading, and projectile trades will kill you with so many capture projectiles. Your wakeup is poked out for free, your best combos off gunshot are only anti-air and only above 18% in the corner, all your zoning can be ducked. Your normals are stuffed by anything, your best option for regaining fullscreen is duckable and stays out for ten weeks. You have two good tools, gunshot, if only because it recovers fast and the second hit breaks a lot of armor, and standing 4. That isn't enough. I wish it was, I want to play Stryker.
Anyway I can only comment on characters I play or play against so: Quan Chi, Cyber Sub, Skarlet.
Quan Chi: The first character where blocking his mixups makes him more dangerous rather than less. I've seen a 46% guaranteed on block combo (More than most X-rays for the same meter) and whiffing stomps actually gives you a very safe way in. Plus nothing is worse than trading a projectile with this guy and having to sit and watch his everlasting jump in to reset shenanigans. Plus the hitbox on that crap is like Ermac TKP, and it puts nothing on the screen. I've had it catch crossup jumps.
Cyber Sub: Great damage (Midscreen 40%) nasty nasty corner game, several resets, which while not Cyrax level let you pressure in interesting ways. Great normals, and parry is a real mindfuck. On the other hand his lack of pokes and inability to deal with pokes means he loses hard to people who know how to pressure him. Still. . . safe-ish divekick is dumb and he can control some matchups, plus landing corner combo to bomb pressure to corner combo is a hoot.
Skarlet: She's the C. Viper of this game. Amazing damage, insane mixups, Weird playstyle and vicious execution. I'm slowly working on getting my execution with her up to tournament level, but she has tools like no one else. Her fullscreen dash to combos to reset is brutal, she has multiple ways to crack 40% and has a 39% reset hit confirm that ends on a 50-50 on block. If she didn't require a level of execution miles above any other character in the game, she'd have an army.