Just had a random thought. Are the most popular, long-lasting characters seen as more heroic because they use primary colors? Or does it have more to do with the time they were created? Let's see...(I'm in a listing mood :) )...

Primary colors

• Superman - Red and blue
• Wonder Woman - Red, blue, yellow
• Captain America - Red and blue
• Spider-Man - Red and blue
• Iron Man - Red and yellow
• Red Tornado - Red, blue, yellow
• Scarlet Witch - Red
• Doctor Fate - Yellow and blue
• Batman (heroic) - Blue
• Robin (modern) - Red and yellow
• Wolverine (original) - Yellow and blue
• Fantasic Four - Blue
• Deadpool - Red
• X-Men (team uniforms) - Yellow, then yellow and blue
• Collossus - Red and yellow
• Nightcrawler - Red
• Ant-Man - Red and blue

Secondary colors

• Green Lantern - Green
• Green Arrow - Green
• Hulk - Green
• She-hulk - Green and purple
• Aquaman - Purple and green
• Hawkeye - Purple
• Wolverine (later) - brown, tan
• Apache Chief - Green
• Psylocke - Purple

Both

• Vision - Green, red and yellow
• Magneto - Purple and red
• Robin (orig) - Red, yellow and green
• Rogue - Yellow and green
• Jean Grey (Phoenix) - Yellow and green

Shades of Gray

• Batman (anti-hero) - black
• Punisher - black and white
• Storm - black
• Black Panther - black