Lumimon is the first Digimon that meets it's human Partner; Isaac.

Lumimon is upbeat and eager to become a strong fighter so it can protect Isaac properly. It is very chatty and sometimes a bit annoying due to it's loud and chipper nature, but it has the heart on the right spot. It may be not the smartest Digimon, but it balances that out with it's enthusiasm and stubborness. One of its weak points is certainly its clumsyness. It often doesn't notice where it steps and trips due to that, or misses a hit on the foe because it literally was too energetic.