Alternative Character Interpretation: Alone. Did he really believe all the stuff about death being the ultimate salvation or was he just pretending to be the bad guy in order to force others to kill him and seal Hades in the process.
Anti-Climax Boss: None other than Hades himself. He doesn't do anything but take a hit.
Ass Pull: Regulus being able to perform both the Athena Exclamation (which requires three Gold Saints) and the Zodiac Exclamation (a move that's more powerful than the aforementioned Athena Exclamation and which requires all twelve Gold Saints to pull off) all on his own during his battle against Rhadamanthys. The only redeeming point is that pulling these moves is what kills him.
Awesome Ego: Cancer Manigoldo and Gemini Aspros both have huge egos (Aspros' definitely shows right before and during his battle against Mephistopheles Yoma/Kairos) and they are indeed very much awesome.
Base-Breaking Character: Alone for his Salvation Plan. Despite being labeled the purest person on the planet, there is a sizable portion of the fandom calling him more monstrous than Hades. However, many fans still like him as they think he's just a Well-Intentioned Extremist and he still pulled a Heel–Face Turn in the end.
Pandora. You either like her for being sexy and a strong woman, or hate her because her attitude toward Athena's Saints and Athena herself is rather... unpleasant. To her credits, though, she gets a lot better after joining with Tenma to defeat Partita.
Broken Base: Whether Lost Canvas is a good series or not. There are three types of reactions regarding this matter:
First Installment Wins: Some people would feel that only the original series is good and therefore dismissing all kind of sequels, including TLC. Not many people have this reaction, however.
Surprisingly Improved Sequel: The total opposite of the above, an amount of readers dislike the original but think that this manga is awesome (it helps that the original has quite a lot of Narm moments and overuses the "Rescue the Goddess" plot). But again, this reaction isn't very much.
Even Better Sequel: Most people in both the original fanbase and TLC fanbase have this. They find the original good, but TLC even better for improving some flaws the original had.
Kardia and Rhadamanthys. "You're the first to ignite the flame in my heart..." Yeah, you can't get any more obvious than that.
Albafica and Minos.
Sylphid and Dohko, a lot.
Manigoldo and Nasu Veronica.
Fridge Brilliance: Explaining Youma's time manipulation powers and fondness of younger brothers as due to being the forgotten Titan Kairos, Kronos's younger brother. Specifically, the Greeks had two words for time, Kronos and Kairos. While "Kronos" meant the natural procession of time, "Kairos" meant a specific moment.
Growing the Beard: To many Lost Canvas fans, the series only got good starting from the Minos vs Albafica fight.
Ho Yay: For the fangirls, this is just added fuel for their Dohko/Shion fanfics! It doesn't help that every single Expy got very, very pretty.
If Milo/Camus has always been a popular couple, Kardia/Degel here are just too happy to make their relationship even more obvious. First, Degel asks Kardia specially to accompany him to Siberia and even convinces him, even though he can easily ask someone else. Second, they are seen together a lot, and in Scorpio Gaiden, their closeness even reminds Sasha of Tenma and Alone. Third, Degel is the only one who can cool down Kardia's heart fever, pretty much making Kardia depend on him, and many other moments. Doesn't help that the way they talk sometimes sound a bit Belligerent Sexual Tension.
Minos keeping praising Albafica's beauty or Veronica with Manigoldo. Dohko/Kagaho's fight also has some.
Radamanthys/Regulus on the front cover of Chapter 200 as well as during their fight.
Alone/Hades with Tenma too especially at the moment when he takes Tenma's head in his hands very close to him as if to give him a kiss. This goes Up to Eleven in the latest chapters (past 212).
And of course Tenma with Yato. They are at first rivals, but after Tenma was rescued from the Underworld, they become friendlier. Tenma regards Yato as a great friend, while Yato despite bickering with him and calling him an idiot a lot, really genuinely cares about Tenma. The infamous Heroic Sacrifice Yato pulled for Tenma, the Get a Hold of Yourself, Man! scene in chapter 216 only helps. Also, sometimes Yato is just like a Tsundere for Tenma.
The Gaiden series is a fuel of this. We have Albafica having Foe Yay with an enemy and being friendly with Manigoldo.
Female example: Phantasos, in female form, licking Yuzuriha's face.
Aiacos full stop. He sacrifices each of his underlings just to prove they are tools.
Yoma is not only sacrificing his family to grant his own wish he also made two brothers kill each other for no reason other than having fun.
Rescued from the Scrappy Heap: Not these Lost Canvas characters per se, but when compared to their classic counterparts. Pisces Albafica and Cancer Manigoldo seem to fall under this trope in Lost Canvas, compared to the original series. Pegasus Tenma might also fall under this as he's far more likable than Seiya to some fans.
One of the first is Pisces Albafica's last stand and death against Griffin Minos. In fact, it is hard not to sob throughout Capricorn El Cid's final scenes. Actually, make that all of the currently dead Gold Saints' final moments, with special mentions to Taurus Aldebaran, Cancer Manigoldo, Scorpio Kardia, Virgo Asmita... hell, all of them. It's all tragic. Damn series premise!
They Wasted a Perfectly Good Character: Aiacos. After his defeat, he starts moping about whether he once had bonds and is interrupted by Kagaho who was sent to kill him. Kagaho instead spares him and tells him to remember his old persona, Suikyo. What does this mean? Who knows? Aiacos never returns.
The Woobie: Crane Yuzuriha in the Lost Canvas Gaiden.