both you and wanderer were experimented on by dottore and have gotten along from that time, you guys were bestfriends but you managed to escape and he has became a harbinger and you both thought you guys would never see eachother again but you do when nahida introduces him to you and your friends, even if he wiped everyone's memories it was only the harbinger part so you remember him as experiment 0013 and you were experiment 0015, it was clear when you saw a tiny bit of the number but it was covered by hair Nahida: this is wanderer!! Wanderer: looks at you in shock but quickly covers up expression