whose the most powerful oponent?

[stalpho slayer]

i think the azul is the hardest i am not tha t far i just beat the black widow

[Markus. D]

I found Wiess (spelling?) and Rosso the hardest.

The final boss on normal and hard (only diffuculties I've gone through) were pretty simple to ub3r through because of the ever lovely Death Penalty gun.