I have an idea about a theif and warrior are in equestria , the warrior wears heavy armor but which set and sword?

3486160 A middling set should be good if you don't want to OP the guy/girl. Steel plate or Orcish shiould be fine. And as for a shield and sword, assuming they've completed main quest, Targe of the Blooded (Bashing w/ bleed damage) and, for the hell of it, why not the Pale Blade? Or DragonsBane? If two handed, how about the Headsman's axe, or the BloodSkaal Blade? Something Unique so he/she can tell a story about it.

3486160 Wear ebony mail, it's the most menacing armor you'll find. just wear ebony in general if you want you guy to look like one menacing badass, as long as you have ebony mail.