What is a npc?

NPC are the Non-Player Characters, which in this instance, are different types of aliens found throughout the space maps. There are seven categories of aliens to be found, each with different characteristcs such as damage, hp, graphics, speed, and more.
Regular alien NPC
Below is a list of current regular aliens:
Streuner
Lordakia
Saimon
Mordon
Sibelon
Sibelonit
Lordakium
Kristallin
Kristallon
StreuneR