Holy shit the snow birthday mission is even better than I thought. When I posted about it yesterday I had to save and finish it today and I found out when you fight Olibee with Dynazenon Yume gets a unique and really emotional voiced line something like 'hang on we'll save you!' Dynazenin doesn't anything to do with the plot of this mission but its obviously because Yume lost her own sister. This game has a lot of really nice details.

I forgot to fight her with Cross to see if there was unique fight dialogue for him too.