Hi,
Battle Splash is determined as a Third Person Shooter, so there is currently no plan for official First Person support. Since the game was targeted for all-ages and everyone, First Person Camera will more likely cause motion sickness than Third Person.
Modding support is intended to address this issue. It is expected that you can create your own characters as well as maps, game modes, etc... However, Official Battle Splash Maps/Modes/Character will provide limited Modding support because of various reasons, so you can only have it your way when you create your own map, own character, own mode, etc...