During the finals of the Sacred games, as Childerich is about do finish-off (and possibly kill) Belcoot, the Prince — who is watching the duel from the Royal Family stand — throws his sanjiegun (A sectional staff; sort of like a cross between a bo staff and a nunchaku) like a lance right between the two gladiators, stopping the match.
Any of Lucretia's plans count for this trope. She's a legend for a reason.
Lym throughout the entirety of the Godwins' occupation. Given everything she's put through, her willing resolve to not shed a tear during the whole ordeal is incredible. Because she doesn't want Gizel and Marscal to win, and if she lets down that last wall and breaks down... they win. She doesn't give in and break down, not even once, until it's all over, and her brother and her Knights have liberated Sol-Falena and can safely return home to her.
Roy's Heroic Sacrifice. It starts with him volunteering for a suicide mission, continues through him defeating Childerich in a duel, and then deflecting part of a rain of arrows with his staff chucks. The final part of the awesome is living long enough for The Cavalry to arrive and save the day.
When Logg and Lun ram a burning ship to destroy Hatred Fortress.
Lymsleia, who is all of ten, smartly declares to Gizel, her husband that the rebel army merely took advantage of his weaknesses, and then declares that she will end the war by riding into battle herself. The girl's definitely ballsy. The fact that it's a plot she engineered only makes it more awesome, even if it fails due to a defection.
If you let Richard duel a Raging Childerich and Guarding at his Super Move, he gets his eyes blinded by the green liquid, but was still able to block ALL of Childerich's strikes! He does this while looking like he's barely even putting any effort on it.
Sialeeds killing Salum Barrows definitely qualifies, though she appeared to be working for the Godwins at the time.
Euram Barrows' Heel–Face Turn, when he finally decides to stop being a fop and take his duty as the heir of the Barrows Family responsibly. This changes him from a wimp to a genuinely admirable character.
If you let Lyon duel Dolph his special attack involves flash stepping behind her for a sneak attack. If she counters correctly, she thrusts her sword backwards and stabs him in the gut before he can do anything. She does this without even looking.
The Prince using the Dawn Rune on Dolph, killing him while saving Lyon.
Lym in the epilogue. She declares that there will not be a re-run of the Sacred Games to select her husband; she will do the selecting herself. That is something her parents tried and failed to achieve! Then she goes further and installs her own brother as the Commander of the Queen's Knights.
