I beat 12/10 mode on FTaH 1, with upgrades but surprisingly with no items. The most annoying character for me was probably Ghost Abe. We... don't talk about Ghost Abe.

I beat 15/10 mode on FTaH 2 and it REALLY broke me. Even with the helpers it was still extremely difficult. You probably know what characters were the most annoying for me, since there are A LOT of them.

they will learn indeed

coming up next: the evolution of homer's shoe in fun times at homer's