Blue Lights

Blue Lights is a main character in a few episodes, therefore making him significant. He is on-screen more than the other background ponies, hence the reason he's a main character. Blue Lights also has more lines. For the most part, Blue Lights is a happy character.

Blue Lights is voiced by Butters Stotch. Butters Stotch does the singing for Blue Lights, as well.

Personality
Blue Lights tends to be depicted as a follower of the crowd, trying to fit in. He doesn't appear to have many friends. He is gullable and can be roped into schemes easily.

Trivia

 * Blue Lights has been redesigned three times, but all were rejected.
 * He appears to bite on his hooves, suggesting he's nervous alot.