Why does Hephaestus favor Thetis?
When Hephaestus had fallen from Olympus/heaven it was Thetis who helped to raise him and welcomed him in her home.
What was Hephaestus weapon of choice?
No, Hephaestus was a maker of weapons. It can be said that being a god of fire itself was a "weapon" as well as the hammer he always had could be used for defense.
No. He loves Cyclopes, and thinks they are one of the best creatures ever, but he is not a Cyclops himself.
Was Hephaestus the god of fire and what was his Roman name?
Hephaestus was actually the god of the forges/blacksmiths. His Roman name was Vulcan.
He was not a warrior, but his assistants made the lightning bolts for Zeus.
Hephaestus was a male god. He was married to the goddess Aphrodite.