Board Thread:Manga/@comment-26495049-20180826105255/@comment-5774380-20180826120129

I'd say the Attacker for the 5th book, and Ymir Fritz's Founder for the 6th. The last Colossal will cover the upcoming arc so there may be a Titan appearance we haven't seen, but I hope there'll be a flashback of Ymir Fritz's life.