The Demifiend (SMT V: Vengeance, Infinite Loop Strategy)

Now it's longer and more hilarious.

Anyways this is just the adaptation of the previously showcased Infinite Loop Strategy that's done to Satan. As this strategy works in essentially any fight where there is a method for your demons to sacrifice themselves. In terms of the quirks of doing this on this fight, you can't have 4 revives to refill with Archangels in this one. Or for any one that's not Satan (Since in that one, the act of trying to cast an ailment gives 2% on top of the 17% that happens when they are sacrificed). I also tried to use Preta to kill him in this one, but I'm unable to do so. So Dagda had to finish the job. But I did manage to cast 16 Magatsuhi skills on this one. Although, I had to cut Impaler's Glory as the way to sacrifice demons here requires hitting a repel. So I used Omagatoki: Pierce instead.

The setup is quite simple here, but it does require having Nuwa and Baal with low HP when summoned. As I observed that Cu Chulainn does not like casting Debilitate when everyone has high HP. And the protagonist having a weakness is important too. As Cu Chulainn always casts Titanomachia as his first move period. In theory, you could have Mastema fish for a critical instead and get an extra press turn that way, but it is not really necessary.

I casted Luminiscent Mirage there without much reason to do so. I was just using random moves there. But as you can see, it would still work. And the best part is it doesn't require Challenge Mode to try out (Although that is a preferable target if we're talking about how much HP you can play around with). And there is a lot more leniency to the types of demons you can bring as fodders, so this fight is potentially better at stacking many more effects all at once.