These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Mephistopholes, who was the one to steal Pandora's brother from her mother's womb, nearly get his wife—Tenma's mother—blamed and subsequently killed for the deed, and treats his son Tenma as nothing more than a pawn in his scheme to Retcon away the events of the main series.
The Gold Saints were this in the original series and one of the main reasons why they're the protagonists in the this series.
Foe Yay: Much more so than in the original, actually. See the entry for a nice long list.
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.
Minos keeping praising Albafica's beauty or Veronica with Manigoldo.
Dohko/Kagaho's fight 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).
The Gaiden series is a fuel of this. We have Albafica having Foe Yay with an enemy and being friendly with Manigoldo.
Les Yay: 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 likeable 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!
But the one that takes the cake is Unicorn Yato.
The Scrappy: Alone, for his Salvation Plan. Despite being labeled the purest person on the planet, their is a sizable portion of the fandom calling him more monstrous then Hades.
The Woobie: Crane Yuzuriha in the Lost Canvas Gaiden.