Azrad can't summon Aeon anymore (the last two are needed for his finale), so he should be helping anyone on foot, lending Scimitars and whatnot.
Nanoha gets her usual beamspam turret role, only she'll likely activate Excelion Mode for the first time here because she has to be serious to save Fate. She can go either on foot or against any mecha, but I'd prefer the former so she gets to reunite with her waifu.
Yuunagi is actually pretty useful for this mission, given that Straybird has absolute stealth and teleportation (why I've never sent him against the Caliban is really bugging Aero, I know). He can scout or make a really good distraction if needed.
Laura's best paired up with Charles. She has more close to middle range weapons with the Schwarzer Regen and can provide support for the Rafale Revive II Custom.
EDIT: There's something else I was supposed to mention...but I forgot what it was while I was typing this. All the above suggestions should be fine though.
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Nanoha gets her usual beamspam turret role, only she'll likely activate Excelion Mode for the first time here because she has to be serious to save Fate. She can go either on foot or against any mecha, but I'd prefer the former so she gets to reunite with her waifu.
Yuunagi is actually pretty useful for this mission, given that Straybird has absolute stealth and teleportation (why I've never sent him against the Caliban is really bugging Aero, I know). He can scout or make a really good distraction if needed.
Laura's best paired up with Charles. She has more close to middle range weapons with the Schwarzer Regen and can provide support for the Rafale Revive II Custom.
EDIT: There's something else I was supposed to mention...but I forgot what it was while I was typing this. All the above suggestions should be fine though.