For Remilia, I dump into Attack purely. The basic idea, I think, is either Pure Attack, Pure Tank(DEF and MND) or Pure Defense. But again, I use Pure Attack, as she is your first, and only, solid ATK-attacker for several floors(your next ones being Yuugi and Komachi, pending on your idea of 'solid'), best to make her last out, lest you run into something Low-DEF High-MND and have a Composite or MAG based party :ohdear:
And, just for the sake of giving a simple idea of my own setup: Meiling: ATK/DEF/HP, Tenshi: DEF/MND/ATK, mostly everyone else: Main Offensive Stat. You might be surprised how effective it can be XD