I've never heard that Superman had a specific motto, per se (like "Not in the face, not in the face!), but a couple of his most famous phrases are "Great Krypton!" and "Up, Up and Away!" which he says as he zooms off.
Supermans tights are red.
Krypton
Fictional.
Darksied
Metallo
justin bieber
Steel
Planet of Krypton
The same as supermans
Clark Kent.
supermans mission was to save the world
flying, super strength