Who do you think is the hardest modded SRB2 character to use/master?

[beakymagma]

Purely asking this question to see what the community sees as the hardest character to use since the majority of modded characters are easy to learn in one playthrough.

 

[Koishii1970]

Nasya and The Kid

 

[SonicHacker141]

perhaps Super Meat Boy. (if you don't count the infinite lives)