Zandra

That's a hard question. I think i'd want a high power combo for myself, with 26 stabs/slashes or so. Or a support one, that buffs other people for extra damage, gives overhealth, or heals extra.

An Achilles that worked before mitigation and that the damage returned could not be mitigated. Also sword arts that aren't arguably worse than my main weapon x3

What would be cool, but most likely broken, is a mixture of high power/status inducing Sword Arts combined with a reduced energy cost ability.

But really it would be tough, because moreso than the mechanics of the ability itself I'd like it to synergize with my current skills.