After the headache of looking at that mess subsides... :P

Olivie's AW ability buffs elves, dwarves, etc. which for you is herself and Spica (I don't see a leveled Yuyu, Rowanna, Rosalie, etc.) so the benefit there is good but could be better, though seeing as she's your best duelist the higher stats would be great and the -1 cost on both Spica and herself is awesome by itself. Would have to get a DMM player to tell you what her skill AW is, I'm not sure.

Cloris gets assassination chance which isn't too bad. Honestly, I'd personally rather have Yuyu's platinum-level attack and she meshes well if you do choose to AW Olivie since she'll get -1 cost and increased stats but you'd have to train up that level 20 Yuyu so up to you.

Honestly, I'd level and AW Len for 1) increased skill cooldown reduction (20% CC -> 30% AW) and 2) All Party members' Defense +5% AW buff (I missed her event *cries*) because those two abilities benefit your whole team (the first is only while deployed I'm pretty sure but the 2nd is just for being in sortie party)

Maxing and AW Claudia is solid for True Damage which is useful for High Def/MDef enemies

Summary: Len > Olivie/Claudia > Yuyu if you're willing to level her (I'd definitely do this if you AW Olivie), Cloris if you're not

NOTE: I am not a DMM player, so I have no idea if events/Skill AW changes these and other units' value down the road