I think they never saw Rouge (or heard her name) and they constructed her 3D model from the fewest clues given by her artwort printed on that Game & Watch wannabe.
Here's what I hear: dong McDonald's happy meal kind sonic Sega gives slime tails soccer sonic skateboard rogue and epic tennis green pop Robert catch shadow basketball knuckles baseball cha cha cha McDonald's and Sega gives slime I'm loving it!