I was talking about arena specifically, but taking that off the table:
I wouldn’t change anything other than the duel skill and special. She has a solid Atk stat so glimmer against targets with under 40Res and Moonbow against those with over 40 would be a good choice for specials.
DC should still be off the table because 1. She has no access to an NFU effect so her Spd won’t protect against “guaranteed follow up” units (which there are a lot of,) and 2. The flash effect is almost useless on EP, since it requires the enemy to initiate against her while other enemy units are within 2 spaces of that unit to maximize it’s worth, which in AR, PVE, and even Arena is tough to make happen.
A catch is still your best bet since that flash effect will guarantee she’ll always activate the minimum +7 bonus and isn’t contingent on placement respective to allies (solos or bonds.)
You could try to mimick popular Kempf builds like fort/escutcheon/etc. but imo they suck… They’re missing the point of a unit with flash. They’re PP focused, period.
And yeah… You’d have 2 blue dragons on the same team, so what? When was the last time you fought a Julia with CC? And have you ever Lilith’d a tank? Yeah, she’s a verb cuz she describes a state or occurence… of absolute murder.