To answer a question brought up by auras. Their stat bonuses stack, but whatever you have on a lower slot will be the only one doing it's cosmetic effect. Ex: I have chose Rainbow Aura during one of my runs in abyss. this was in the first slot, the 2nd slot I put maze walker (the descending rate is much faster if that question wasn't answered). I then came across Gold Aura after defeating my opponent, which went into my 3rd slot. The next fight I had just a gold aura yet of the both aura bonuses were in effect.
I have the following auras. I believe all are 5k
Red------+50 ATK
Black----+100 HEAT
Silver----+50 DEF
Gold-----+25 ATK & DEF, +50 HEAT
Rainbow--+50 ATK & DEF, +100 HEAT
I also have Start Heat Up for 5k which makes you start with full heat at the start of the match (goes above heat recover). Counter Puncher for 5k, but not sure if that's either allows counters to sometimes be fatal, or regular attacks sometimes be counters.
Everything else it seems everyone has. I do have Ragna, Rachel, and Izayoi's special things listed in shop but haven't tried it yet
EDIT: Just tried Rachel's SP Thunderbolt and her electric attacks are much stronger. Idk percentages but 236 B into detonation does 1195 while normally it does 895. Maybe looking at something close to 30% increase in electrical attacks. I had Mr. STOIC on so all my stats were 0