Normal mode is just super buffed. You have safe jump setups into OSes, really good footsie buttons, strong frame traps, etc. GA Mode is certainly ridiculous, but there MUs where Normal mode is pretty useful when it's not set play. However with OD and D Sonic Saber changes, it's so easy to steal that turn and make it setplay anyways. Utilizing jD air stall is also amazing for Normal mode (and GA I suppose).
The sprite is good, especially on oki. Shadow as a Nine player is ok, imo. Shadow's pretty strong that he's able to switch mains with each game but I sort of feel like that holds him back. He's gotten better with Nine though, but there were others I liked more (can't recall the names). Ram head is the one with armor? It's only body attribute and it goes away if you ever block something. Didn't seem to strong when the socal Nine's tried to use it on me.
Mirror's ok. My friend tried to use it against my Izayoi. Doesn't really do much imo since it's still difficult for Nine to deal with Izayoi from getting in.