More comments:
-Pidgeot is pretty much unchanged from his untwinked form beyond getting +10% speed and Giga Impact. It still 3HKOs average (although is very close to a 2HKO) and may well need to eat some nasty recoil to even do this, along with its bad durability. Still, Feather Dance off his boosted speed is huge against fighters. Against mages he'll need to rely on 2HKOing them most likely, but... he can sometimes do that, so yeah, works in Middle certainly.
-Silence... okay. Looking things up, Crystaliser uses the same added status routine as Cockatrice, while Assassinate mimics DeadEnd. These are based off Will, which Dullahans don't boost, so they're pretty much useless with the current build. Thus Silence has 3HKO damage, mystic coup de grace, above average speed but fragile. This could be Middle (average damage + coup de grace is barely turn 1 status), but Neph may want to switch out the non-sword Dullahans for something else since they're not useful. (Even the default Suzakus would be better since they boost Vit.)
-Water Rune Milich is an awful lot like Sonya with more durability but less speed. It's a losing trade, but certainly still enough for Middle: 3HKO damage, blind, and 15 shots of full healing off 1.45/1.41 durability goes a long way.
-Momo is a Heavy, so isn't eligible.
-Aeris... Stop is a nasty, nasty status, and it's 60%. With Haste, Aeris easily kills most opponents before Stop can wear off (7 turns in theory, slightly less in practice). So she's got turn 2 status and lots of turtle/healing options, FF7 positive status is all really potent (half all damage, double speed, half enemy speed, reflect). Aeris does likely fail to run the gauntlet, as noted (although Stop does beat Cloud, the one status he can't block!), but she's one of the strongest duellers nommed so far, I think, with limited resources (although limit healing can ease this) and low damage her only real weaknesses, along with being slightly below average speed. I'm not certain if she loses to anyone else nommed so far, though this is certainly correctable.
EDIT: Actually, the more I think about it, the more I'm not sure about Aeris losing to the guantlet.
Beowulf: The only person who clearly beats her. Block Stop, apply petrify, Aeris blitzes nothing.
Rydia: Comes down to views on status and who you see landing their status first. If Aeris is seen as faster, then her status being 60% means that she may win to some views, for all that she doesn't to mine.
Lyn: If Haste is seen as shutting off doubles, Aeris surely has this. If it isn't (i.e. my views), it depends on your views on FE criticals probably, Aeris will go Haste/Heal, Protect/Heal, so Lyn needs to proc a fatal crit in her first two turns (or a doublecrit through Protect before Stop lands). This could go either way.
Demi: A resource war which I have a lot of trouble parsing at the moment. Kinda leaning towards Aeris (again, the free limit healing goes a long way) but not sure.
Cloud: Gets owned by Stop.