lets do this then
if HoloEN had a second phase, they would:
Ame: revive to full and periodically summon aditional ames with 20% of her total hp
Gura: turn read attack faster
Kiara: revive 5 times and each time she has a smaller hp but deals more damage and explodes like malenia in her flower attack
Mori: turns into a big deadbeat like Lord Wolnir in DS3 and summons a horde of skellies
Ina: gets naked - lots more tentacles and ink
_
IRyS: has actually a second and a third phase focused on her angel and on her devil side
Bae: starts to fight in a dancer-like martial art and gets faster when her hp gets lower
Sana: doesnt have one
Fauna: heals to full, converts your summons to her team and starts putting sleep stacks each attack
Mumei: true horror
Kronii: freezes you in place, gets really slow and really fast at random intervals
_
FWMC: you fight both at the same time. When Mococo dies Fuwawa gets fuzzy attacks and turns purple - When Fuwawa dies Mococo gets fluffy attacks and gets purple. If both die at the same time the hidden challenge boss Pero gets summoned
Shiori: when she gets to 90% of her health she starts to talk nonstop and at 50% a cutscene plays where she just talks and you cant skip for 4 hours
Nerissa: all her attacks are now aura based since it's all sound. She gets naked with feathers around her covering the nsfw parts
Biboo: sheds her outer skin turning red like magma and adds frenzy to her attacks
_
GiGi: fully hatches from her egg and grows up, getting new attacks and +dmg and spd
ERB: fire fucking everywhere
Cecilia: turns greener, shends her skin to reveal only the doll bits and gets 3 more pairs of arms
Raora: goes full furry as a panther, naked with pink fur covering nipples and pussy