Music: What's the Strategy?
Palanquin Ship - Hall
Now I know I come across as a complete jerk who doesn't care about anyone but myself, but I actually don't want you to die, Sakuya. Never do that again.
Music: Determination in the Chest
Palanquin Ship - Bridge
Let's get going already! We need to pay them back for everything they've done.
Palanquin Ship, full speed ahead! Set our course through the center door!
We're settling this night incident, here and now!
Personality: Resolute (Hit: +1, Miss: -1, Kill: +4, Get Hit: +2, Ally Killed: +2, Graze: +1)
Character Skill: Vampire (On Night stages, character recovers 10% of HP/MP at the beginning of every turn. On Day stages, terrain ranks are crippled unless the Parasol item is equipped.)
Personal Skills: Scarlet Charisma (+20 initial Power to all SDM members), Queen of the Night (increases Vampire's HP/MP regeneration to 20%), Devil Wing (Unfocused Move +2), Devil Guard (gives a -1000 damage barrier)
Spirits: Sense, Accel, Spirit, Focus, Pressure, Valor (45)
If Remilia were a 2.5 like the rest of her mansion, she'd be pretty incredible. But she's a 3.5, and at that Cost it's kind of expected you have some sort of gimmick going for you. And unfortunately, the only thing I could really say about Remilia is that she just sort of sucks. Her stronger attacks are gated at 130 Power, she's crippled on daytime stages unless you either waste her single item slot or pair her with Rumia, and she just... can't do much. She's not super dodgy, she doesn't have an amazing damage output, she can't tank, her spirit set isn't very impressive, and she doesn't have a particularly useful support role unless you're committed to deploying the entirety of SDM. I guess she could have been useful if she joined earlier, but she pops up one chapter before Imperishable Night ends. And spoilers: there aren't any Night stages in the latter half of the game. Every time I try and use Remilia she just sort of farts around all chapter then drops a finisher on the boss. And if I wanted someone solely for their finisher, Youmu is right there.
Remilia would probably be better if Scarlet Shoot could actually do decent damage.
Battle theme: Emblazoned with an Eternally Young Scarlet (Septette for a Dead Princess, Dark Prison)
While we're on the subject of Remilia, she and Sakuya make up the last of the four IN teams. And, um, they're not very good.
Visionary Scarlet Devil Team
Youmu and Yuyuko can rest in peace because these two are the undeniable worst of the four canonical teams. Not only do you get them last, but they completely clash. From the Costs you'd expect to have Remilia in front and Sakuya in the back, but Sakuya is a pure frontline unit. She provides nothing but mediocre damage when she's in the back, and her entire defensive setup is completely wasted. But if you flip things and put Remilia in the back, what is she going to do there? Cast Accel, I guess, but I shouldn't even have to tell you that that's a total waste of a unit. Worse yet, there's literally no reason to use Scarlet Team over Servant Team. It's more costly, Remilia isn't as good as Meiling (both as a unit and as a partner to Sakuya), and, the kicker, if you're going to team Remilia with anyone, it's gonna be Rumia. Maybe if Remilia was around during the bulk of IN, Scarlet Team could have been kind of cool. But as is, if you want to use Scarlet Team you need to give up Remilia's item slot. Or deploy Rumia separately, give up one of Sakuya's item slots for a Firefly Gem, and run a full Night team, but that's just gimmicky.
There is kind of a bright spot for these two, though. A future character really wants Meiling as a partner, and that sort of leaves Sakuya stuck up a creek. So for lack of a better option, you might decide to use Scarlet Team. Or you might just bench Remilia and Sakuya entirely since they're both kind of lackluster, but eh!
Reisen Udongein Inaba