splasher
/ˈsplæʃər/Definitions
1. noun
a person who plays in or jumps from a fountain or a pool of water, especially as a form of entertainment
“The children were thrilled to watch the splasher jump into the pool at the amusement park.”
2. noun
a person who splashes water, especially in a playful or careless manner
“The splasher ruined the party by drenching the guests with a water balloon.”