Shawn and Cory ("Boy Meets World")

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Show: "Boy Meets World"
Main Character: Cory Matthews
Trusty Sidekick: Shawn Hunter (left)
Solidification of friendship/loyalty: Shawn kept Corey cool; Cory kept Shawn honest. Both had their moments of stupidity and heroism. Perhaps more bromance than hero-sidekick, but Shawn really had the eleventh hour rescue down by the end of the series.