Deserved a comic because: Metroid's ending, arguably the first decent plot twist in a videogame, set the tone for the series' story. Without stopping for ten-minute cutscenes between levels, the games have maintained a subtle focus on story which deserves to be explored with the nuance of a top-quality manga adaptation.
Above: The nuance is in the way the 'toe is implied, rather than shown
Made the transition by: A series renowned for its almost Buster Keaton-ish levels of dialogue-free plot development obviously wanted for only one thing when it came time to make the leap to the printed page: buckets and buckets of yacking. Dialogue, interior monologue, disembodied chat... if it put words on the page, Magazine Z's Metroid manga was all over it like stink on a monkey.
Why'd it work? The austere, ominous solitude of the Metroid games couldn't be further from the raucous adventures of Samus 'n' chums. Yet the character-heavy plotting and explosive artwork masked a playful respect for the source material: many of the additions, after all, were brought over from Nintendo's own adaptation.
Above: Who doesn't?
Sonic the Hedgehog
Deserved a comic because: Everything about Sonic the Hedgehog was calculated to endow the character with the absolute maximum amount of attitude. In fact, Sonic became a hedgehog when it was discovered that hedgehogs can pack approximately three times as much attitude as the humanly possible limit. (For the record, the maximum amount of attitude exhibited by any one person is displayed by the Fresh Prince of Bel-Air).
Anyway, Sonic's full charisma isn't in evidence when he's jumping on TVs to get magic shoes, so why not give him a comic?
Above: Also, the games couldn't figure out a way to have Sonic meet the President
Made the transition by: The Sonic property was handed off to the folks at Archie comics, best known for preserving comics' view of young people as milk bar-frequenting 1950s cliches for six decades and counting. Who better to handle an IP whose idea of “cool” was last updated around the time we took MC Hammer seriously?
Why'd it work? Gamers are quick to decry the soap-opera-for-furries tone of Sonic's ongoing adventures. But kids are mad for that shit, and who are you to deny them? Best to just let comics' masters of the no-second-base young-adult romance work their magic, while we twiddle our thumbs and wait for the next game to provide our ring-collecting fix.