Heres my little analysis of Aileen
Basically, she is a fucking beast. If you manage to reduce the enemy elemental weakness with another unit (Seven or Marie), the possibilities with her are endless. I did test with a crappy golem staff and second knife and i slaughtered all the bosses i tested alone.
But, seeing as a self-sufficent unit, The best equipment for Aileen now are Artisan-Great Sword (save the queen). But Orlandeau needs more the Great Sword than Aileen so if you have both, is better to use Artisan-Katana with Aileen.
Thats the great about aileen, if you have few copies of your TMs, you can adapt Aileen's build and not hurting your other unit's builds.
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GAF i need a favor please. Im going to do my "Gilgamesh vs FFXIII" video but i need a lightning or Snow Friend.
If its snow, with high HP and safety bit equipped (if dont have safety bit dont worry, i can adapt my strategy with Vanille's Auto-Revive)
If its Lightning, the best ATK possible with Diabolos, Excalibur and whatever other weapon you want.
Can you help me please? Thanls guys, youre awesome!