if it's plat curse user, the only gacha one is eva. not really useful aside from anti-golem pretty much. neither Ur nor Eva is core unit to me, neither are they priority utility units. They'd be my benchwarmers.
no idea which map you're referring to and I have no idea how far you're at. just watch atarime videos is probably your best bet: https://www.youtube.com/channel/UCTK...h7R-9uA/videos