Storage upgrade function is of course, removed. Only characters box, equip box, and team number increase remained.
Pumkin... is good when your team doesn't mainly consist of magic girls.
Ionocidium... She got funny sprite (big plus points!), and with enough skill activation in your team, she can be mini Dendrobium who is reliable in long, drawn out fight.
Red Spider Lily... extremely great with 45% atk boost, especially in those broken hard map. Like Kodaibana.
Peony... I find her quite lagging. Especially if you don't aim for another crit.
Kerria... Broken, F**king broken. Damage boost+ dracula move is pure broken, put her in skill activation up+skill damage up/crit up= death of pests.
Peek in Himeuta and it seems like developer is caring enough for people who use FG to expand storage, they will give FG back equal to how many you use to expand. So no waste nor dump move.