So I'm ripping models from a mobile game and when I import them into Blender there are always nodes and often lines like these that appear. What I want to know is what they are, their purpose and if it would be better if I kept them to help me rig this model.
The objects with the lines are blender objects that are called empties. They represent a single point and orientation in space, and are generally used as a marker for something else.
In this case, looking at their positions, I would guess that your importer is importing the bones in the mesh as empties, so these actually mark the bone positions. If this is the case you will probably see that many of the empties are parented to each other in a similar hierarchy as bones would be.