Mesumon (Fated Partner)

It is said that Mesumon are messengers of good omens und luck. 

They love to explore the world around them and learn about new things, making friends, and enjoying the occasional rest. But their most important task is to deliver messages around the digital world and its most prominent beings, like the archangels or royal knights of Yggdrasil.

They can always be seen smiling and spark with positivity wherever they go, which may be the reason why most Digimon smile with joy when around those critters.