Warrior was the generic catch-all type for things without an obvious type for a long time. (Hence why cards like Stuffed Animal and Hungry Burger are also Warrior.) They vary that a bit more now, though seem to use Fairy more than anything else for it these days.
It's probably cybernetically-enhanced armour. (SUPER Roboyarou's certainly is, as seen in Cybernetic Zone.) The fact it says it "upgrades" also hints at it. Not sure why that of all things is something you decided to question.
Damn with shield & sword too op 3000 atk damn so op tier 0
Paradox brothers skill can special summon labrynth wall (3000 defence, 0 attack, and Rock) whenever you want. That with staunch defender and wall of disruption/mirror wall/ or super headlong rush. Game.