All of your favorite sidekicks are deserving of a top list, except I would never think of the Portal cube as one :D My all-time favorite sidekick is one and only... Morte from Planescape: Torment. Love his banter :) (other notable skull sidekicks: Murray from Monkey Island, Bill from Driftmoon)
@HKILLER88888 Hmmm, not even remotely similar, except for the fact both are 2D. This is a survival adventure game, while Cave Story is a side-scrolling platformer. Both are great games though :)
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