In Co-op mode, Islay's REC stat is increased from 5 to 6, due to her base ATK of +1. Islay's passive does not visibly change, but functions differently:
- Islay cannot challenge enemies when meeting them on the field. This is similar to how her passive works in Normal mode, but applies to enemies instead of players.
Islay's Hyper, Rival, has a slightly different effect in Co-op. The Hyper can only target enemies and not players, but otherwise functions the same as in Normal mode.
Islay's passive and Hyper are unchanged in Bounty Hunt mode.
Islay's base stats give her 22 starting stars and a markup of +45% at shops.