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So I may have an idea for Towa. The goal is to get the idol live for shorter special cooldown, so you're constantly cycling between blasting with the special and having the bonuses from the pill and the hat when you go into cooldown. All the items put me around 80% crit/haste and the shades and crit stamp are worth it because you're actually getting crits. I don't really know what collabs are a good choice here other than the idol live, and you obviously can't use another super collab with this playstyle.
The raven feather was just an early drop and it would probably be worth saving the last item slot for something defensive because the vampire stamp wasn't healing me all that much and I think it'll be inadequate in harder stages.