Gustav Pendragon appear in Suikoden II.
During the Gate Rune Wars, he helped the South Window Army to invade the Senan Area of the Scarlet Moon Empire. After the Toran Republic was established, they were defeated by the Toran Republic Army. Granmeyer the Mayor of South Window retreated his troops and Gustav blamed him for their defeat.
When the Tinto was attacked by Neclord and his Zombies the New State Army came to help. Neclord also kidnapped his daughter, but she was saved by Riou, Viktor, Sierra Mikain and Kahn Marley. After defeating Neclord Gustav formed an alliance with the New State Army. After the Dunan Unification War, Gustav declared Tinto's independence and he gain his last name Pendragon when he became the first President of Tinto.
- If you talk to Gustav after liberating Tinto he will give you a Mother Earth Rune.