Reroll.No. Reroll. A week is nothing. Reroll until you find a 100% Eidolon.
It might be painful, but if you like what you've seen so far, then it's well worth it.For a new player? Debuffs, debuffs, debuffs. There's a reason why The "which Soul should I use?" thread says that you should rush Mordred - debuffs are amazing for you.
Out of the ones you listed, Dike (A type, -15% Def) and Light Amaterasu (B type so you can stack with Dike, -15% Def -15% Atk) have debuffs. Also, while Urania technically also has a debuff (A type, -5% Atk) that's uh... so pathetically low that you should forget about it. I think that's the only bad debuff in the game, really. Once you've covered debuffs, it's time to look at others. SSRs will pack a punch, so Michael. Djehuti has a fairly nice skillset.
But really? Reroll. You'll be better off. Build something for that element once you get a 100% Eidolon.After debuffs, the single most important thing to your damage output is your weapon Grid. Skill leveling Assault weapons of the same element as your Hime will make you do way more damage otherwise.The Eidolons who effects are in play are your Main Eidolon and your chosen Friend Eidolon. These passives are active all the time.
The other 5 Eidolons are there just for stats, and their On-Use ability. Mostly just for their stats.