Donpa (ドンパ Donpa) is the elderly former mayor of the town of Lunpa, which was named after his famed father who settled the town, Lunpa the Righteous Thief. Nowadays, however, he lives in Lunpa Fortress in distress as his son, Dodonpa, rules Lunpa with an iron fist, with his nefarious empire of bandits and thieves sullying Lunpa's name as an honourable thief.
Donpa is bedridden over this, but if Isaac's group comes to Lunpa to confront and defeat Dodonpa, Donpa will be quite happy to throw his son in jail until the latter learns some virtue. Afterwards, he will thank Isaac and allow him to get a Mercury Djinni he fought "long ago", Tonic (which couldn't have been too long ago, as the Djinn were only scattered across Weyard when Mt. Aleph erupted at the beginning of Golden Sun).
- In Kalay:
- Kalay Soldier: "Dodonpa is a very evil man. His father, Donpa, is heartbroken at the state of Lunpa now."
Donpa's age can be estimated to be close to 100 based on how the great flood that transported Babi and Lunpa into Lemuria is described by Babi in the first game as having "happened a hundred years ago," which might allow for a few years to be taken away. When Lemuria is visited in the second game, Lunpa knows the name of his son to be "Donpa," indicating he was there to have Donpa before getting caught up in the flood. However, a seeming writing error occurs when a later conversation in Lemuria's palace purports Lunpa to have arrived at Lemuria 150 years ago, which would be impossible given how infeasible it is that Donpa had reached that age naturally and without any life-extending enchanted fluid when Isaac's party meets him.