Once you turn on the game and get to the part where it say start and contune..

I think you mean Kappa well he lives in the lake near the lake mine (near the big boulder that can only be broken by a cursed,Blessed or mythic Hammer And a bonus for kappa is throw him a cucumber (in The water) twice then the next day give him 1 cucumber the next day for ten days so it goes

Day 1. 2 cucumbers
Day 2. 1 cucumber
Day 3. 1 cucumber
Day 4. 1 cucumber
Day 5. 1 cucumber

And so on until day 10 but remember they have to be 10 consecutive days.

(So ten days in a row) then he will give you a blue power berrie I forgot what they are called but it allows you to have more energy whilst using tools so you can get further down the mine.

I Really hope I helped you.

The green guy is the Kappa, if you throw a cucumber for 10 days in the lake, you will be given a blue power berry that ups your stamina and lower your fatigue in rainy or snowy days