That new Knotweed for 90FG in the FG shop is very interesting. Skill act x1.65 turn 1, +35% crit rate and 45% crit damages and a bonus -15% DEF for ennemies. +45% crit damages is a good buff and +35% crit works espacially well with self crit buff girls like Balsam or RRose. She is really good for a almost free girl. A must have for turn 1 crit teams. And for "only" 360 FG you can get her max equip slot.
She is maybe even better than Kugaisou.