In Co-op mode, Ellie's REC stat is increased from 5 to 6, due to her base ATK of +1. Ellie's passive and Hyper do not change.
In Bounty Hunt mode, Ellie's passive does not change.
Ellie's Hyper, Ellie's Miracle, has a different effect in Bounty Hunt. Upon use, the player will gain ATK equal to the total amount of Norma completed, DEF equal to 1/5 the amount of earned Fame, and EVD equal to 1/50 the amount of held Stars. This effect lasts for 2 chapters.
Ellie's base stats give her 30 starting stars and a markup of +25% at shops.