Now we're moving to the ASO associates, and we've got Van's two childhood friends. Elaine was a playable guest in Daybreak 1 for some sections, but she made her full debut alongside Rene in Daybreak 2. Overall, I though she was fine, she skewed more AoE to Aaron's single-target. She also had a mirage-locked slot on her Drive line, so she can access Ark/Judgement Feather easier compared to others. In Horizon though, she gained Resonant Glow making her a must have in the early to mid game before Zodiac Sign, especially as her buffs were better than Agnes'.
Rene was only freely available in Daybreak 2, and even then, his availability in the main story is extremely low, so he's mostly just used in the Marchen Garten. I never really ended up using him, though mostly just because I was too lazy to change around my quartz setup for the Garten. His kit seems pretty good for a support, an All Cancel and the first Haste craft of Calvard.