I joined Ker's Harem team in the last releases, and one of my missions was to rework combat, especially Rhea, among some other.
In Harem Remastered Rhea will be as balanced as possible. The fact she can equip two weapons make her difficult to balance due to how high her attack value can be. But we have tried to make her as interesting as possible, while being true to Ker's wish to make of Rhea a "combo character". If you have opinion on how to improve her I'll be glad to hear, be it on our discord or just by email ( contactfylokongames@gmail.com ). (Note: Rhea was released in c4m1).
I'm a little behind on the Remaster, haven't tried it out fully. The usual flaw of dual-wielding is that its a hardwired stance, all offense and minimal defense (no shield, minimal armor to maintain mobility; glass cannon). My issue was that Rhea was all that and slow AF besides! She needs quickness, even at the expense of everything else. Active weapon blocks could stop incoming direct weapon shots at her, but be useless against magic, physical area attacks (grenades or grenade-like objects), or flail attacks that could "wrap around" a blade but impact flat against a shield. She could take a damage (strength-based) penalty for single-handing long swords, maybe deliver 75% of what someone else (Sarah or Ralph) could per hit with the same weapon (for a 150% max damage) because they commit and follow through with their strikes whereas she pulls away quicker to stay in the "flow". OR instead of longswords, have the Tenta use shorter swords, like the classic poignard, or something like Rikku's "comet" scimitars in FFX, which also does less damage than longswords.