This is the giant Link bead sprite created by Redditor BoxMacLeod (links to a gallery of even more of his work). It is most impressive. I used to be into Perler beads myself but I'd always iron them for too long and the whole damn thing would melt into a blob. I suck at frozen pizzas too. No kidding 'oven temperatures may vary', because that thing is on fire.
Thanks to Slick Nick, who's so slick he forgot to include the link the first time he sent the tip.