User blog comment:KachiExa/Servant's Best Craft Essence Guide-1★ & 2★/@comment-34352073-20180406223723

Just a few additional (and unasked for) suggestions, at least based on my own experience.

Arash: Demonic Bodhisattva, at least if you're only planning on using Stella once. The OC more than makes up for the lack of a NP dmg CE.

Benkei: Debuff success rate or any Defense CE, really. The guy's a stone wall when used properly (though only once per 5 turns).

Leonidas: From my experience, I'd say a starting NP CE works pretty well. Once he gets his first NP out, he can get the ball rolling pretty quick. As a side note, works best in a more Arts-oriented team (preferably with Buster NPs).

Phantom: Critgen-boosting CEs. It's unfortunate, but he's (at least for the moment) pretty bad at most things. I've had some success running him with Be Elegant.

Caligula: Limited/Zero Over works best imo. He's plenty fragile already, no need to make him more so.

Eric: I've been toying with the idea of slapping Golden Millennium Tree on him and pairing him with a healer. With that much HP, he could fire off his NP with impunity and also mitigate the fragility that comes with being a Berserker... Haven't really used him in a while, though.