Yep, this is always the first boss I think of when it comes to hard bosses. Or at least ended the most number of runs for me personally. So much bullshit from a relatively early-on boss.And another one, Alma from Ninja Gaiden Black:
Difficulty level doesn't matter, Alma is just hard.
All of her attacks hit like a truck, she's got a command grab with a massive hitbox to catch you in recovery, and you have to land a heavy knockdown (or anti-air through her very high dodge chance) in order to get a damage window.
And on higher difficulties, she has friends.