Watching Toxsa's mini moments of awesome back on earth in episode 5. Like mastering the level 8 vault jump, catching a large stack of books one of the teachers nearly dropped on him, too confronting and taming the school's runaway mascot, a wild boar.
Guren / Bravenwolf's first transformation into Titan Mode in episode 6 while battling Vilius.
Chooki/Lydendor: Yeah let the crazy out!
In episode 7, "Tributon Extreme" Beag proves his more then just a Flat Character by fooling Slyger into stealing a "fake" Dragon cube so he and the Corekai can retrieve the real one without further Corrupted interference.
That and Ceylan / Tributon selflessly fighting off Slyger, despite being forced to face him all alone do to the others being captured or injured thus achieving Tributon's Tenkai Titan Mode.
When it appears Beag's just died by falling into a deep chasm in episode 9, the boys decide to get serious and Robofuse to make Slyger pay for his part in Beag's apparent demise.
Once reunited with Beag, the boys manage to not only Robofuse normally, but manage to include Beag and his men as well forming both the Proto Jet and the Air Lancer Jet. Giving a whole new meaning to More Dakka.
Guren / Bravenwolf's big battle with Villius in episode 13. An epic sword fight between two Humongous Mecha superbly animated, with Visual Effects of Awesome, both fighters putting everything forward. It ends with Bravenwolf unleashing a Wave Motion Gun that apparently vaporized Villius...only for the reveal that he survived, somehow, and is ready to commence his plan.
For the villains, in episode 16, Slyger and Granox finally return and both show off there new Titan Modes.
Which Ceylan/Tributon swiftly takes away from them with his Big Damn Heroes moment.
Ceylan/Tributon: Now playing! Tributon and the Voltjet!
Near the end of episode 18, Bravenwolf and Tributon unlocking Titan Fusion and literally wiping out all the clones.
Episode 22 starts off with an Action Prologue where Vilius has made his way to the Guardians sanctuary. Boreas and the other guardians (minus Eurus) however are not impressed with Vilius or his army. The other guardians point out that they'd normally vote on how to handle a situation like this, but Boreas points out that such a vote would be unnecessary.
Near the end of episode 23, once the boys retrieve the Black Key Gen appears and tries to take it. What happens next boils down to an all out full on bare knuckled knockdown, drag-out fight out over the key. While Gen does manage to retrieve the key, Guren did put in a good effort.
Best of all? Beag's finally learned how to trash-talk.
Near the end of episode 33, Lydendor single handedly defeating Guardian Notus after attaining a new kind of Titan mode that allows him to move as fast as lightning (literally).
After a long, harrowing battle with Guardian Eurus, Guren goes Elemental Titan Mode and outright slices through Eurus' barrage, and then goes full Raiser Sword with his elemental attack, outright slashing Eurus' massive form in half.