I think it could be that orange is a vibrant color that catches the eye and gives the characters a unique look. It also helps to distinguish them from others in a crowded cast of characters.
Quite a few. 'Adventure Time' has characters with orange hair. Also, in 'Sailor Moon', you can find such characters. Usually, it depends on the creator's imagination and the style of the cartoon.
Well, usually such cartoons might have characters with very distinct and unique personalities. Maybe they are a bit rebellious or stand out in some way.
They usually have bright and vivid colors to make the oranges look appealing. The cartoons might also show the texture and shape of the oranges in a cute or exaggerated way.
Well, orange man cartoons often have unique styles. Sometimes they focus on comedy, with slapstick humor. Other times, they might tell serious stories with an orange man as the main character. The settings can vary a lot too, from fantasy worlds to modern cities.