I'm Freakin' Robin

 is an unlockable Variant for LeBron James.

Season 1
Reach Tier 50 in the Free! Season 1 Battle Pass.

Origin
This Variant is a reference to a scene from Space Jam: A New Legacy in which LeBron and Bugs travel to the DC universe in order to convince Daffy Duck and Porky Pig to join their basketball team. In this sequence, Bugs gets dressed up as Batman while LeBron gets dressed up as Batman's iconic assistant, Robin, with the title literally coming from LeBron's reaction to his costume.

Trivia

 * and New Legacy are the only Variants so far to be revealed via the Twitch Extension.