[Coda]

.75, not 75. That is, -25%. It's HP/ATK/RCV leader multipliers. So for example, Beelzebub is 2/2.5/1 and Sonia is 1/2.5/2.5, and those number multiply together, so a team with both leaders has a total of 2/6.25/2.5 -- that is, 2xHP, 6.25xATK, and 2.5xRCV.

So my Izanami team paired with Kanna has 0.75x HP (that is, a 25% HP reduction), a 14x ATK bonus, and no modifier to RCV. Kanna has a 1.5xHP bonus to Dragon types so if I had any light-element God/Dragon types I could offset that HP penalty, but the only one I had (Fagan) turned dark-element when I evolved him. (It's not that the skills need them to be light-element, but all of my team's active skills synergize around creating and enhancing light orbs.)

ml, there is no dark Izanagi. There's a dark Izanami that drops from the descended dungeon, but that's a different monster.