I don't think level 30 haters or anything are that much of a problem. A level 1 can easily take them out. They do higher damage, but eh. Haters on the first few floors can fight enemies to decrease their health or you can usually sneak up on them for high damage suplexes+2 stomps. I can usually kill them or get them near death with that.
ALSO FOR THE FUCK OF GOD DO NOT FIGHT HEAD HUNTERS. JESUS CHRIST.
I threw a grenade mushroom at him and I'm not sure if it did any damage.
He shot me for about 8665~ damage with some laser looking gun. My fucking god.
And if anyone can figure out how the quests of no armor or no dodging work, I'd love to know. I've not rolled or used armor for a climb from ikegara to imokawa-cho, but I didn't complete the quests. I'm not sure if there's something I'm missing. I'm killing all the enemies as well as it says to do unless it means don't kill them all for some reason. It's not really clear.