He is voiced by Kosuke Onishi in the Japanese and Kyle Igneczi in the English version of the anime.
Neinhart is a slim, purple-haired man of average height. He wears green armor.
During the meeting, he is mentioned to be in the castle but isn't present in the conference room.
During the invasion, he stays on the ships and is later confronted by Erza, Kagura, and Jellal. He uses an Historia of Simon to take Kagura and Jellal of the battle and uses three Historias to attack Erza. After Erza destroys the three Historias he becomes afraid because he hurt one of Irene's relatives. After Jellal tries to attack him, he uses Simon's Historia once again, but Kagura destroys the Historia. Jellal then defeats Neinhart and the Spriggan 12 member falls in the ocean.
Neinhart later appears during the meeting and creates Historias of God Serena, Wahl and Bradman and advises them to protect him. He is then sent by Irene to kill Erza and manages to overpower Brandish and Lucy, but is defeated by Natsu with a few hits. He was later shown to be imprisoned alongside Marin Hollow, but returned to Alvarez later.
A year later, Neinhart is imprisoned for trying to wage another war.
- He is the first villain to defeat Erza, despite not being active in battle. The second is Irene, who manages to do so directly. The third is Kyria from The 100 Years Quest sequel.