How to build Maribelle?

Depends on how you want to use her. After all, Savage Blow is probably the most desired C and Seal skills for healers, so that's something to consider.

What ideas have you considered?

I dont know what kind of build your looking for,but here is what mine is,it's basic and affordable

Standard pain razzle dazzle build. +3 speed A slot.

I would go with standard savage-vantage (close conter) build, since her stats at +0 (neutral atk/spd) are better than +10 +Atk/Spd Priscilla, and i have seen such Priscillas wrecking havoc.

I have one CC to spend, and i cant figure out who should get it. :/ Maybe it will be her.