Hashirama founded the village, Tobirama created system like schooling and etc. Madara is the other one who was founder which means that Izuna or Mukuro is 4th but given that Izuna gave his eyes to Madara and Hinata knows somehow Mukuro I would say Mukuro is the last one.
Hashirama + Tobirama + Mukuro = 3 founders
"Three of the four founders of Konoha are here and it seems they are around your age."
Webnovel
Hashirama founded the village, Tobirama created system like schooling and etc. Madara is the other one who was founder which means that Izuna or Mukuro is 4th but given that Izuna gave his eyes to Madara and Hinata knows somehow Mukuro I would say Mukuro is the last one. Hashirama + Tobirama + Mukuro = 3 founders
"Three of the four founders of Konoha are here and it seems they are around your age."
The Crimson Moon
Anime & Comics · DemonicPanda