Generator Rex/Heartwarming

"White Knight: This was not our finest hour. Rex: What are you talking about? White Knight: [laughs] It's good to have you back, Rex. Holiday: ...you know, I think he actually means it."
 * Six's gift to Rex in "Promises, Promises".
 * White Knight to Rex, of all people, at the end of "Payback."

"Holiday: Six:
 * Pretty much all of "Divided By Six", when it wasn't being awesome.
 * There are two moments that stand out in particular. The first is when One tells Six how proud of him he is for helping to save the world. The second is when Six tells Rex what convinced him to halt his pursuit of being the most dangerous man in the world...helping to raise Rex.
 * Made even more heartwarming
 * In "The Swarm", when Rex 'dies' his life flashes before his eyes - a life that consist of eighteen months by his memory span, but he sees the most important people in his life, including his adopted family at Providence.
 * A lot of "A Family Holiday" is composed of this towards the end. The most memorable is the speech Six gave to Holiday.

Six:."

"Rex: That was... I'm... wow. Six... I've never said it... and I'll probably never say it again, but... I'm honored to be your partner. But don't ever do anything like that again."
 * And then, after giving Six crap for much of the episode about being the sidekick, Rex gives us this.


 * The Mood Whiplash moment in "Exposed", where Rex tells Diane to respect the family members of an EVO he was unable to cure.
 * "Six Minus Six" despite being an absolute tear jerker for the implications for Rex and Six's relationship, had some great bits, finally culminating in this exchange:


 * Another Tear Jerker/Heartwarmer:


 * At the end of the same episode
 * "Lions and Lambs" is chock filled with these revolving around Breach.
 * Rex meeting up with Six, Holiday, and Bobo again after they've gone underground.
 * Six and Rex have a few brief moments in "Crash and Burn" that show while  after the Time Skip, he still cares about Rex in his own way.
 * During "Heroes United", White Knight chooses to stay by Rex's side to help him fight the Big Bad. It really shows the change he has gone through because of his respect for Six and Rex. From Jerkass Knight Templar to Jerk with a Heart of Gold Reasonable Authority Figure, I dare say.
 * Kinda surprised no one's added the part where Rex hugged Six when he found out he was out of his coma, not to mention that Six actually said something positive in response to his reaction. It made this troper's heart flutter and dance.
 * During a sparring session with Rex, Holiday (lightly) threatens Six if the session were to go wreck any of her equipment, to which Six just answers with a small smile. It's more than enough clue that some things didn't change.
 * Holiday's Indirect Kiss to an unconscious Six before
 * The end of "Riddle of the Sphinx", when Rex offers to help the Fish Out of Temporal Water villain Garan-Set adjust to the present day and tries to save him from his Nanite breakdown. Sadly, the pharaoh refuses, preferring to Face Death with Dignity.
 * "Double Vision" is one long father/son moment between Rex and Six
 * At the end of "A Brief History of Time".
 * At the end of the Grand Finale "Endgame"
 * Although he says it in his usual gruff, serious tone, there's also the culmination of multiple moments of increasing fondness for Rex. He tells  that their agreement no longer applies, effectively absolving him of the need . Considering how the series introduced him, that's quite a big deal.
 * What bothered this troper about the season when Black Knight was in charge was how quickly the Providence agents had betrayed Rex when in previous seasons they treated Rex with respect, even baked him a cake. Then Rex smashes one in the episode Endgame Part 1, revealing it to be an android, meaning that all of Providence's soldiers are robots built by the Consortium. Later in the episode, Rex is on the ropes from fighting the Consortium's Humongous Mecha when he is saved by the ex-Providence soldiers who had deserted when Black Knight came into power.