Is turtle hermit stronger than Goku?
Goku was able to beat him without going Super Saiyan, but taking him down did take some effort. During the battle, Goku surmised that Roshi had been training in secret, which means that Roshi is much more powerful than anyone gave him credit for (especially when using his bulked-out, Max Power form).
Who is Master Roshi based on?
15 His appearance is based on God in Dr. Slump. Since that franchise doesnt have much of a fan-base here in the West, it isnt widely known that Master Roshis character design is heavily influenced by the character of God from the Dr. Slump series.