The nomads to end all nomads!

Well it's a little misleading I mean they will stop marching to sleep and eat and stuff. Sometimes they aren't in a straight line when they're sitting around relaxing so I mean it isn't like the line leader has no idea who the guys at the back of the line are

What happens when two lines of marchlights meet head-on?

If two marching lines see one another they always fight. They never get along. It's not their line they have to get beaten up!

They don't have problems with genetic diversity because a bunch will always get bored eventually, wander off, and rejoin a different line some time later.

A reasonable answer to a silly question!

Nomadic hoof people are good people.

Do they have any per-line customs/dress/foods/etc.?

They don't have hooves they have tiny dainty paws

no they are made out of a basic element so they are too simple to have a varying culture

they are made out of fire like all life is just made out of an element and marchlights are made out of fire and that's a simple element

the sparklefoxes are made from a complicated element that is lightning which is when fire and water come together and they are complex enough to have variations in their socities