Plumbers

The Plumbers are an intergalactic law-enforcement organization that makes use of many high-tech gadgets and weapons to protect the planets in the universe from various alien threats and attacks. Max Tennyson is the most recognizable of the group, and is the leader of the current generation of Plumbers.

In the game, they can be mission givers or shopkeepers. They can usually be found in high risk areas (given that Earth is fighting against an alien threat, it makes sense that of the NPC groups, the Plumbers are in these situations over the others).