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Tear Jerker: Gargoyles
The Destruction of Goliath's clan.
The tears start coming when Goliath returns to the castle in the pilot and sees the devastation, including what he thinks is Demona. He scoops up remains, chokes out 'My... angel of the night...' and then lets out the most heartbroken wail...
Goliath being denied everything... EVEN HIS REVEEEEEENGE!!!
Near the end of "Reawakening", Coldstone not only has a change of heart, saving Goliath from the frigid New York waters, but is seemingly killed shielding his rookery brother from his own rookery sister. Thankfully he shows up alive later, if 'alive' is the word...
Near the end of "The Price" "Macbeth" blasts the fake Hudson's statue. Goliath has a totally understandable freak out and later grieves for his oldest friend. Thankfully this becomes a happy tearjerker when the real Hudson arrives alive and well.
Goliath and Thailog's first meeting in "Double Jeopardy". After realizing that he has a responsibility to his "son", Goliath reaches out to Thailog, only for the twisted clone to turn on him for no real reason at all.
Goliath: Life for a Gargoyle isn't about profit. It's about protecting those you care for.
Thailog: I considered caring about you. It took some effort, but I arranged for you to join this party because I planned to share the money with you. But our little family reunion disappointed me father. So I've decided to hate you too.
The four-parter "City of Stone," with the flashbacks to Demona and Macbeth's origins and interactions.
The flashback scene in which MacBeth must leave his family and country forever. It gets even worse when later on, it shows that his leaving did no good whatsoever and his family was still murdered.
The moments between Macbeth and Gruoch, his wife, as she goes from shock and horror at his resurrection, to happiness at his survival, to sadness that he's got to leave forever. Between the actors and the animation, it's gloriously heart-wrenching.
Derek Maza. Pick an episode featuring him anywhere from Metamorphosis to the first half of Season Two. Any episode within that time.
The first episode is a total Downer Ending. Brooklyn has a crush on Maggie and prevails on the others to offer Maggie sanctuary with the clan. She still sees him as a monster and violently rejects him. He is heartbroken at the end of the episode. Derek basically pulls a That Man Is Dead on his sister Elisa and she spends the end of the episode just crying her heart out.
Not to mention Derek trying desperately to hide his true identity from Elisa, establishing the ongoing subplot. He slips almost immediately, and she realizes exactly who he is.
It's also the only episode which ever succeeded in making this troper outright hate Xanatos and wish for his head on a pike.
The Magus's entire sub-plot in "Avalon." He watched the girl he loved slowly fall for a somewhat younger man (who is pretty much the Magus' surrogate little brother), and pretended to be happy for them in a classic I Want My Beloved to Be Happy. He mentions (to Elisa, an outsider) that without his magic he has nothing to offer her, but that's not his true reason. It's because of the guilt he felt over cursing the Manhattan clan to remain stone for a thousand years. He's actually punishing himself for a crime that has been forgiven and forgotten long ago. The arc culminates with his Heroic Sacrifice.
Seeing what happened to the Captain. It becomes a Heartwarming Moment when he finally redeems himself and gets to ascend to the afterlife.
Captain: Thank ye, Goliath.
The episode where Broadway is playing with Elisa's firearm, accidentally shoots her, and his resulting freak out.
What made it really bad was that this troper was surprised by the whole episode, and was paying attention the entire time. Broadway's guilty sobbing lasts longer than the scene itself, implying it was originally longer and more painful.
No mention of how The Gargoyles are revealed to the world at large... and thought to be a menace? Especially Angela's reaction
Angela's reaction to learning what kind of person her mother is.
Seeing This Troper's favorite of the Manhattan Clan blinded by what must have been a horrific off-screen mutilation, shedding hopeful tears from empty eye sockets at Goliath's return, being shot in the back protecting Goliath, then MUSING ABOUT THE SUNRISE before dying in Goliath's arms is flat-out HEARTBREAKING. This stood out in "Future Tense," an episode so frigging dark that Goliath being struck by lightning is one of the least disturbing moments.
Pretty much the entirety of "Future Tense" genuinely hurts. My favorite happens to be Lexington, and... that episode. All Just a Dream or not, it doesn't matter. Seeing him so utterly damaged and fucked-up, to the point where he hurtles off the Moral Event Horizon, betrays everyone he once loved including, indirectly, baby Alex, and essentially damns the entire world - all starting ostensibly because of Goliath's devastating "abandonment" of him and the clan... I still have a hard time watching "Future Tense". Baby, Lex, my sweet little geek-goyle, what happened to you?
When Fox's mother Anastasia reveals her true nature as Titania, Queen of the Third Race and wife of Oberon, and is describing her relationship with Fox's father, Halcyon Renard ... and dismissively states he was unable to hold her interest. "Truthfully, no one can, save Oberon." After we've already seen (earlier that episode) how dismayed he was to hear she had remarried. Ouch.
While neither had behaved like saints, I'd imagine any mother and father could sympathize with how helpless Xanatos and Fox must have felt after Oberon made his intentions to take Alex known.
What makes it worse? It's the first time we've ever seen Fox crying!
No, what makes it really bad is the fact that Xanatos, the man who has tropes named after his cleverness just stands there, feeling helpless against this overwhelming supernatural force.
Yeah yeah, I know we don't consider the Goliath Chronicles canon. But c'mon, who didn't shed a tear at the ending to Genesis Undone?
Goliath: Thailog, I wanted to tell you...
Thailog: I know, I know. So much to say, so little time. Before I go, I have a something for you Goliath. Courtesy of the good doctor. How I, how I did enjoy... causing you grief...
Moments later Goliath pulls off a roar that hasn't been heard since the very beginning of the series, when he first saw the remains of his clan in the pilot.
Then there is Sevarius' reaction to the death of his 'son'. In the words of Hudson, "He almost makes me feel sorry for him."
Early in the episode, while debating whether or not to help the clones. Lexington argues that while the clones are stuck dealing with Sevarius, they have a choice to opt out. But one look at the poor state of the clones is enough to make all the gargoyles decide to take the risk.
That and all the Gargoyles coming across each of the clones, as they (permanently?) turn to stone.
While the animation was poor, the Goliath Chronicles episode "For It May Come True" stood out as one of the darkest and most heartwrenching episodes of the season.
Pretty much the entirety of "For It May Come True" is enough to bring genuine tears, both happy and sad. Goliath finally gets his wish to be human, and be with Elisa... and everything goes downhill from there. While it was thankfully All Just a Dream created by Tatiana, seeing Goliath so utterly helpless. Watching helplessly as Xanatos crosses the Moral Event Horizon, killing everyone Goliath loves including Elisa.
This exchange between the now human Goliath and Hudson, after Hudson fails to recognize him.
Hudson: Go home to your family human!
Goliath: You are my family!
Goliath's confession to Tatiana about how good it felt to be a human. To be accepted by human society and with the woman he loves.
Quite a few moments in the Bad Guys spinoff:
Sora telling Yama that he is lost to her, because he will not allow her to be shamed by accompanying him on his quest for honor.
The dramatic irony of the reader of the comics knowing that Oldcastle, who acted as Dingo's only parent for much of his childhood, actually murdered Dingo's mum. The comic never mentions if or how Dingo found out the truth.
Jason and Robyn Canmore's estrangement from their little brother.
Tasha's suicide. What really made it so awful for this tropette was the sight of Thug comforting Erin... and Benny (the woodlouse/roly-poly/pillbug) curled up into a ball, trying to shield himself from what was presumably a traumatic thing to witness.
Obviously, the destruction of the clock tower is one of the most tragic moments of the series. Hudson getting hurt makes it worse.