Quentyn Quinn, Space Ranger/YMMV


 * Marty Stu: The main character. He's unbeatable, all knowing, smarter and saner than anyone else, who is never, ever wrong, no matter what.
 * More accurately, he's better, smarter, and saner than the crew of the Star Ship Enterprise--- which is not so much lowering the bar as outright laying it on the floor.
 * Also he's not unbeatable, as the meeting with the assasin shows he's not a lux adept, that makes his ancestor was far more skilled than he is despite being the bottom of the class. It's not that he's unstoppable it's just that the standards have dropped.
 * Also unlike his ancestor, the main character had to go through a rigorous training program to become a ranger, and it's stated in the opening that rangers are essentially considered elite professionals: Best trained, best equipped, the cream of the crop of all the forces of the empire. They have to be in order to operate pretty much independently for extended periods of time in potentially hostile environments. They don't give a ranger badge to just any fool who applies. It helps if you consider the main character as the Sci Fi equivalent of Green Beret, Navy Seal, or a Spetsnaz.
 * Disproportionate Retribution: The Kvrk-Chk. Was destroying an inhabited system too much, or the only way to make a hyper-carnivorous, Scary Dogmatic Aliens species stop trying to eat people long enough to make them listen to reason?
 * Mind you, given that the Kvrk-Chk declared war first, it's a case of Combat Pragmatists giving the Proud Warrior Race a taste of what real war is like. "Yeah, we suck at close combat. It's a shame you'll never get there." Besides, the Kvrk-Chk are considered a horde of alien locusts with Explosive Breeder tendencies, with an extreme monoculture that stamps out all individuality. So, you wiped out 100 billion bugs? Well, there will be ten times that number born in the next 20 years, and if you've met one Kvrk-Chk, you've met every Kvrk-Chk.
 * Here's something else to put things in perspective: the only reason that there's any debate on the Kvrk-Chk is because they are sentient. If they were non-sentient life-forms that committed their atrocities out of pure feral instinct, no one would bat an eye at wiping them out even if it demanded wiping out several systems using a stellar lance, as long as the Horde of Alien Locusts was stopped. After all, no one wants to be eaten by bugs, and you can't negotiate with a non-sentient lifeform. However, since they are sentient, all this discussion and debate occurs, despite the fact that they declared a war of annihilation on every sentient species in the universe, and have no compunctions against eating and killing (in that order) other sentient beings, even, or especially, unarmed and defenseless ones. While you can argue that they are a product of their original environment, that doesn't change the fact that as a species, they chose to treat all other sentient species as chatty food. The only real difference between the Kvrk-Chk and a non-sentient species with the same biology is that, if you hit them with a big enough hammer, they'll realize that maybe all-out war isn't a good idea with a technologically more advanced species.