Apparently like Escaflowne and Cardcaptor Sakura, Sadam has decided to take the route in making the male main character and make him into the MAIN CHARACTER, period.
And given their newfound freedom to rip it apart however they can, Gary is now a super-intelligent, awesome knight that fights for good wherever he can. Score! Which of course, begs the question… what happened to Lina?
From the S.H.I.T. Head himself:
“Rina is Gary’s spunky kid sidekick, and also a fierce magician. We here at Sadam are actually quite proud of how we have thoroughly destroyed the Lina Inverse people know and love. Rina is just as spunky as Lina, but now she is 11, with dreams of being a grown-up…”
“…However people keep calling her a child, which makes her angry. We think that younger kids can really identify with Rina. I know I do!”