Krista Lenz

"I don't care about your reasons or your Secrets! No matter what happens, I'm on your side!" Historia Reiss, but at the season 1 of Attack on Titan, just before the Trost District battle, when she was in the cadets, wasn't in a relationship with Ymir (yet?) and was called Krista Lenz. The only change in her scenario is that she's 18.