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Barney Stinson (Neil Patrick Harris) is Ted's wingman and good friend (though Barney considers Ted his best friend).
Barney is a womanizer and it's revealed it's the way he is because he was once a hippie who wanted to join the peace corps but lost his one serious girlfriend, Shannon, to a suit wearing rich womainizer.
Barney then became that man and ever since is always seen out in a suit (except to funerals) and utters some of the best catch phrases and pickup lines in television history.
Barney once violated the bro code and slept with Ted's ex-girlfriend, Robin. Barney has true feelings for Robin, as revealed to Lily, but does his best to hide them. They ended up dating briefly but broke up after half a season.