Wim has dark hair which he keeps cut in a crew cut. His civilian clothes consist of a long-sleeved shirt and long pants.
Wim participates in the Scout Regiment's raid on Liberio in the year 854. As the Scouts retreat from the battle Holger joins his comrades in celebrating their overwhelming victory against Marley. Their celebrations are interrupted by a girl boarding the airship and shooting Sasha Braus, prompting Wim and the others to beat her and her companion mercilessly.
Following Eren Jaeger's arrest for disobeying orders, Wim is among the soldiers who leak the news of Eren's detainment to the press to pressure the military into releasing him. After they are caught, the perpetrators are all arrested and Hange Zoë says they will be prosecuted.
The rebels are freed from their cells by guards who have also sided with Eren and rendezvous with Eren himself outside of the city. Eren declares that their next objective will be to find and team up with Zeke.