Fodder olivia yt?

No
She is ridiculous and will be able to be the first dancer scoring at the armour level

She's a very strong dancer for ftp content but if you have to fodder her give chill spd to a support unit

I don't see how Chill Speed would be better than Brave Lyn's unique Sacae's Blessing b skill. It flat out stops melee weapon users with DC from retaliating

And why would you want to kill that beautiful Olivia with that polished new and improved AKIRA art

I wouldn't personally recommend Chill Speed to Brave Lyn. Sacae's Blessing prevents counter attacks from a majority of DC users. Chill Speed works great on YT!Olivia since she won't be needing her B slot for combat and since she won't see combat anyways.

You could always save her for another team, considering she can buff all of a units stats and give them another turn, all while being perhaps one of the best dancers.

Don't do it, she is a flying dancer and is great for any content in the game besides high level arena. There will be some sort of GHB or challenge where you wished you had her. And now with the upcoming duel skill she will probably be the only dancer that's useful in lvl 19+ arena for a while.