Red Robin is a name that has been used by several fictional characters in the DC Comics Universe.
On the alternate world of Kingdom Come, a middle-aged Dick Grayson reclaims the Robin mantle and becomes Red Robin. His uniform is closer to Batman's in design, rather than any previous Robin uniform. Red Robin then reappeared in promotional material for the DC Countdown event; Eventually, it was revealed that this Red Robin was not Dick Grayson, but rather Jason Todd who appeared under the cape and cowl. During the Scattered Pieces tie-in to Batman R.I.P., Ulysses Armstrong briefly appears as Red Robin. In 2009, a new ongoing series was introduced titled Red Robin. The new Red Robin is revealed to be Tim Drake (under the alias of Tim Wayne).
In Kingdom Come, a middle-aged Dick Grayson reclaims the Robin mantle and becomes Red Robin, not at the side of his former mentor Batman, but rather with Superman's League. His uniform is closer to Batman's in design, rather than any previous Robin uniform. Age has not slowed him down, as he possesses all of his stealth and fighting skills. In this story he has a daughter with Starfire; Mar'i Grayson (Nightstar). Starfire has apparently died by the time of the story, according to the Elliot S! Maggin novelization, and Nightstar calls Bruce Wayne "Grandpa", despite no blood relation. At the end of the comic and the novel, Bruce and Dick had reconciled.
In Countdown to Final Crisis #17, Jason dons a Red Robin suit from a display case in the "Bat Bunker" (Earth-51's equivalent to the Bat Cave) as he and Earth-51 Batman join the fight raging on the Earth above the bunker. Jason keeps his new suit and identity for the rest of his tenure as a "Challenger of the Unknown", only to discard it on his return to New Earth and revert to his "Red Hood" street clothing.
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