With a high enough Subtle score, you can kill the Monarch's consort and get away with it. Alternately, you can spread rumors that gets them executed, keeping your hands clean. Not bad for a sixteen-year-old Impoverished Patrician.
If you participate in the joust in Choice of Romance and have a high Magic score, you'll pull off a stunning victory that manages to impress the Monarch, aka the most powerful Death Mage in the land.
During the assassination attempt on your sons in the third game, the guards will tell the Player Character to stay locked up in their room where it's safe. The PC can respond with "screw that", run out, and fight offthe assassins themselves.
In Til Death Do Us Part, figuring out how to break Tomas's control over the nobles and the Monarch, then bringing his crimes to light. The Monarch has his hands cut off and his tongue burned out as retribution for mind raping and mind controlling almost everyone in the palace. Basically: everything was going All According to Plan for this Magnificent Bastard...and then you came along.
Out of all the epilogues of Til Death Do Us Part, the most awesome ones are the ones where your teenage sons lead a rebellion and kill the monarch, either to avenge you or free you.
The one where you lead a palace coup against the Monarch and rule as Regent isn't bad either.
Choice of the Vampire
If you kill your Dominus and run off at the beginning of the game, you find your way to a small, secluded town. You, a days-old vampire, successfully take it over and rule the citizens through fear as their new overlord, for decades.
PC: A little something called "divine intervention".
(cue the ground opening up beneath him and swallowing him whole)
Choice of Zombies
When Michael/Michelle/Brian/Bonnie suggests you and your group to abandon Justin/Jennifer who has very serious Heroic BSOD moment. If you refuse the advice.... and snap by saying that Michael/Michelle/Brian/Bonnie should feel ashamed (and eventually does) for even suggesting that. Then, the said jerkass character will look on you with newfound respect, and your other companions (especially the kid Kayden) will start looking you like you're a hero.
With enough skill in piloting a Mecha, it is possible to battle the enemy's Ace Pilot, Commandant Hawkins in single combat and to fight them to a standstill during your first battle and then handily defeat them the second time. Your wingman puts it best:
Asadi: "Boss, did you just beat the shit out of the Blue Masque?"
While it's meant to be a Sadistic Choice, it's actually possible to get through the Chapter 7 battle with neither most of your fleet nor Crown Station destroyed, although it's very difficult and it will result in the death of Asadi, so it's not feasible for players romancing him/her but is feasible for players romancing Watanabe or Weaver, who will die if the player prioritizes the citizens on Crown Station since an attack on the fleet will damage the Caliburn. Here is how to pull it off: first, when choosing which stat should take a penalty during the tutorial mission, don't choose Presence, as you'll need to be able to command your lance later. Second, on your planetside mission, choose strategies in line with your highest stat so you make it through the mission without losing any members of your lance. Third, maintain a good relationship with Asadi by talking to Asadi during free time during each interlude (your second free time slot can be either Weaver or Watanabe if you're romancing either). Finally, during the chapter 7 battle, you'll get an option to have your lance do one task while you do another; choose either to have your lance defend the fleet while you disable the Imperial superweapon (you must have chosen to move forward to prepare for an attack earlier in the battle for this to work), or to have your lance disable the Imperial superweapon while you defend the fleet (you must have chosen to hang back for defense earlier in the battle for this to work). Commandant Hawkins will later inform you that your lance either stopped the imperial ships from getting through or took out their superweapon, which the lance will only be able to pull off if you still have all members of your lance intact and you have a good relationship with Asadi (otherwise they'll fail in their task), although unfortunately you will later learn from one of your allies that Asadi died in the process.
There's a way to do the above without losing Asadi. Make sure you have a good presence stat and then after your debriefing talk to Captain Baelyn and ask her why she defected from the Imperial military. You MUST do this step, as she will give you a vital insight into the way Imperial officer's minds work, which you will use later. During the battle go for the Imperial flagship with your lance and demand that Crown Station be spared and your fleet allowed to withdraw. You'll use your newfound knowledge of how the Star Marshall's mind works to manipulate him into agree to this, which he does, allowing the rest of your fleet, Crown Station and your entire lance to survive.
If female, then the Player Character had to put up with Prototype's sexist comments the entire game. Taking him out with a single punch is very satisfying.
Your grudge match with your former friend JJ. The media's hyped it up, the fans are hyped up, and it's a long, grueling but epic match wherein you can finally step out of their shadow and show the world just how far you've come. And then you can reconcile with them after everything they did to you, which is kind of awesome too, in its own way.
Regardless of who you face at Ring ofValhalla, the promo that gets cut together is suitably impressive, but the best of the bunch is if you face off with The Rival.