|And that makes Kirai a real person!|
Kirai's upgrades are cheap, thankfully, and are pretty useful. The upgrades are needed to bring her back to the power level she enjoyed prior to the 2E change over.
Here's the list:
Kirai (Absorb Spirit, Immediate Vengeance, Swirling Aether)
Datsue Ba (Spirit Whispers)
7 in the cache
For my 50, I'm considering adding Izamu the Armor with Aura of Decay. Should be fun.