Androids

As a DB, I have 1 primary and 2 secondary stats, if I played xenon I'd have 3 primary. Just the base stats itself is more important than the attack once you get around enough stats in. It beats having only 1 type stat + attack, although I'm quite saddened its untradable entirely. I was hoping those fires of phoenix or whatever would've worked on them too but oh well.

Well, yeah, I was making sure you knew that they're not tradeable, so you can't reuse them, and Flames don't make entirely untradeable things tradeable, unfortunately.

There are other permanent hearts too, but Beryl one is the most readily available because everyone can get one from Hot Time. The others, while still completely tradeable after equipping, may be a bit better, but they come from NX-only CS Gacha Box events. Best one being the Superior Lidium Heart (it's just a name, not a Superior item, as in, the property), which is not only permanent, but it has two more slots and is, unlike the other perma hearts, which are level 30, level 80, so it receives 3rd Tier potentials.