You really should lighten up, Twilight! It's a party!
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~ Spike
Spike is one of the main characters in My Little Pony: Friendship is Magic. He is a small purple and green dragon who is Twilight Sparkle's assistant and roommate. Spike also handles communications between Twilight and Princess Celestia, burning Twilight's written messages with his fiery breath to send them and then coughing up the scrolls Celestia sends back. He frequently displays a sardonic personality and laughs at others' misfortunes, but can be counted on to help Twilight and her friends when they need him. In some of the episodes, it is shown that Spike has a major crush on Rarity, but she only sees him as a friend and is unaware of his affections until she becomes aware of those in season 2.
Twilight hatched Spike from an egg as part of an admission exam for a school of magic run by Celestia, gaining both her cutie mark and a chance to study under Celestia's direct guidance. His greatest achievement is saving the Crystal Empire.
He was voiced by Charlie Adler in Generation 1, Brian Drummond in Generation 3 and Cathy Weseluck in Friendship is Magic
Spike is a male baby dragon with green and light purple scales who is adopted by Megan and the ponies after they defeated Tirek. He is the only character to appear throughout the whole Generation 1 series, from the original episode to The Prince and the Ponies.
2006
In the G3 Specials, he is shown to be knowledgeable on things and gives the ponies some advice.
Trivia
In My Little Pony: Friendship is Magic, Spike is the only male character with major protagonism, among the main characters of the series.
In Generation 3, He happened to have a Full Name, Master Kenbroath Gilspotten Heathspike. Unfortunately it was only proven to be canon to first and current generations.