"Slim Possible" - "impossible" phonetic pun, with the Slim name, moniker or pseudonym; the "impossible" wordplay is also relative to the "unstoppable" wordplay the Stoppable family bear, in that both are superlatives. This name reflects Slim's physical state (which is, predictably, slim) and maintains the consistent rhyming theme of the Possibles (phonetic -im).
Confidence: 99
