Hi guys,I have a doubt here,

Are there any npc that actually ride horses?Or just the dragonborn Rides?

I've seen NPCs named 'Noble' riding on horses with a bodyguard trailing along beside them and you sometimes stumble across hunters riding as well. So, yup, others ride.

Like above:

Nobles, Hunters, "some" Peddlers, the Headless Horseman.

You will find hunters and nobles riding horses as random encounters throughout Skyrim. That's the only ones I have seen.

There is a Dawnguard agent who appears as a random encounter in the wilderness.

I usually find the Peddlers in the Reach being attacked by Forsworn.