Len'en 4 - BPoHC Hard All Bosses No Miss No Bomb No Flashbomb Lvl0 Tsubakura/Tenkai
didnt put yabusabe in title because I used them only for kuroji and the reason is kuroji still felt too cheesy with tsuba lol
and yes I didnt wanna cheese too much on hard so I didnt pick suzumi or sese
the biggest problem was obviously suzumi, took 479 attempts according to bpohahaac with a caprate of 10% on first spell - seriously what in the world is this attack??????????????????????????????????????????????????????????????? and then there are third, fourth and fifth(survival) spells, they are very questionable too
para is also very notable because of the last 2 spells
other notable troublesome bosses are tsubakura, yaorochi, yabusame and kujiru
some other bosses that could give you problems are shou, kunimitsu, sese, kaoru, hooaka, sanra, chouki, clause and tenkai
btw para second spell and garaiya first spell safespots are actually luckspots, you will die randomly at times but doing them is actually more consistent than trying to cap them normally (especially garaiya first spell, what is that)