Originally Posted by
Unregistered
I went through my Battle Soul Catalog, but I don't have any units named Kotomi. Did you perhaps mean Toyotomi Kumiko? If so, then Ren Qing-Cheng, Toyotomi Kumiko, and Date Mai can work as a great front line. Toyotomi has a good def rating and high attack power. Her Skill has a good rate on Stun too.
As for Oda Sayoko, I only use her in backrow in Inf Castle as she dies too easily if all the enemies attack her with their basics while in front row. While it's nice that she collects Rage faster that way, it's useless if she dies. I have a lv 20/30 Strength of Unity (6 Star Guild IOT) on my Oda Sayoko, but she's still far too squishy to tank front row properly.
Also, please make sure you take advantage of "Unit Positioning". Ren Qing-Cheng always needs to be Slot 1 for Skill Rate up. Uesugi Ayako needs to be in Slot 4 so she can buff your attacking units as well as lower the enemy Def. Lu Wu must ALWAYS be in Slot 6. Having Lu Wu in any other slot is a waste as she removes Rage with her attack. So it's absolutely necessary that she's the last unit to attack with her Basic or her Skill. Also, while "Unit Positioning" matters, so does the order in which you use your Skills. For instance, Ren Qing can add 200 Rage to each ally with her Skill. So, it can be more useful to use her skill last (or 2nd last if Lu Wu has Skill) if your other units are really close to getting their Skill. It's entirely possible to even use someone's Skill twice in one turn. Personally for myself, if my Lu Wu can kill 3 enemies with her Skill, I can immediately use it twice in a row