Ickis and Krumm comforting the heartbroken Oblina at the end of "Smile and Say Oblina".
Ickis' bonding with Fungus in "Puppy Ciao"; how devastated he gets when he has to send Fungus back to his human owners is somewhere between this and Tear Jerker territory.
Oblina scares the bullies of her brief human friends at the end of "The Monster Who Came In From The Cold".
Oblina: Where I come from we have an expression for humans like you... we call it GUTLESS!(pulls out her organs)
The Gromble gets one where he encourages Ickis that he didn't fail in his quest for the Holey Pail, having been sent on that same quest himself 400 years ago, and then lets him sleep through class.
The episode Monster Blues is pretty heartwarming. Ickis befriends a blind blues man named Mr. Robinson living in an old condemned building. There's something about whenever Ickis makes friends with a human. In this case he and his new friend vent their woes by singing the blues. Ickis even helps the old man save his building from getting torn down and saves his life. The old man tells Ickis he just has to face his troubles and that he's a scary monster after all. After everything he gives Ickis his harmonica and later we see the building is still there. They just decided to build the office building in top of it.
In A Friend Indeed Ickis bonding with a monster named Plastoog who, years ago, was ostracized by nearly all of his Academy classmates just because he had a human face. But like Ickis, one bonded with him despite this, and they became close friends. Who was it, you ask? The Gromble.
The Gromble and Plastoog reuniting as friends after so many years.
In "Super Ickis" The Gromble dresses up as Ultra Monster to save Ickis and Krumm when they get in over their heads and were almost squashed by a human, and gives them an inspirational speech about staying in school and how scaring comes from the heart, not from a costume. To see him do that for two of his students shows what lengths he'll go to help them in their time of need is really sweet and shows his 'well meaning, fatherly' side to his students whether they know it or not.
Gromble: Boy, the stuff I gotta do to get these kids to listen to me.
Slickis telling Ickis that he has the makings of a truly monstrous monster at the end of "Chip Off The Old Beast." The next episode of the season, "Where Have All The Monsters Gone" actually has Ickis save not just his class but possibly the entire monster world.
The end of the episode "Blind Love, Monster Love". In short, Ickis falls in love with a Punch and Judy Hand Puppet, mistaking it for being alive. Doubles as a Tear Jerker, too.
Ickis: Nobody's perfect. *beat* But you were pretty close.
The end of the episode "Spontaneously Combustible." Despite being taken out of school by his father, who was afraid of Ickis' condition, Krum goes back to find Ickis and reassure him that they're friends.
Even before that, the Gromble shows his fatherly side not once, but twice during that episode. The first time is when he uses a history lesson about famous monsters (all of whom were afflicted with the same condition that Ickis has) to point out that these famous figures became an important part of the monster world despite their condition (and, by extension, implying that Ickis could do the same). The second time comes when he chews out everyone for believing the rumor mill and ostracizing Ickis:
Gromble: ...I told you that [Ickis] wasn't a danger to any of you! But you listened to the rumors and were afraid. Do you know what else is afraid of something they don't understand?! Oblina:Humans. Gromble: And is that what you all are like? A bunch of humans?!
Fridge Brilliance kicks in when you think about it. The Gromble had lost his friend, Plastoog thanks to paranoid bigots, and seeing Ickis suffer the same thing probably made his blood boil. No wonder he was so mad.
Best of all? His words had enough impact that not only do Oblina and Krum (the latter of whom had been taken out of school by his father out of paranoia) go looking for Ickis, but so does the rest of the class. A couple scenes later, they're all bunking in Ickis' dorm out of solidarity — even Zimbo, who started the whole mess in the first place.
And, of course, there's Oblina. She never treated Ickis any differently, and encouraged him to ignore the fear of the others.
The end of "Misery Date." It would have been a regular stinger were it not for the fact that the Gromble had his heart broken moments earlier and on the verge of denouncing love.
In "A Wing and a Scare", even though he gets picked on by his little sister, the boy was more concerned that his sister was scared and tries his best to calm her down.
In "Wake Me When It's Over", a sleep walking Ickis may have intentionally Throw the Dog a Bone for the girl who got scared by her cruel brother when the two were riding on the roller coaster. After noticing the girl closing her eyes out of fright, Ickis did his scare and left before the girl realized what happened, sparing her the knowledge that the monster scared her brother and the other kids.
In "Escape Claws", Ickis (although misguided thinking they were monsters) saved the lives of six lobsters set to be eaten at a restaurant. He gave his WORD that he would get the crustaceans back to their home in the ocean, and despite all the trouble he caused? Even the Gromble is touched by his dedication. If there's one thing a monster can be counted on, it's giving their WORD.
"I Heard the Snorch Call My Name":
The Snorch gets equipped with a voice box that allows him to speak for himself, revealing him to be a smart and sensitive creature. This causes Oblina to start hanging out with him, leaving Ickis, Krumm, and Zimbo feeling unhappy. When Oblina and the Snorch go to a factory to scare some workers, Oblina becomes lethargic and falls from an overhead catwalk, landing on a crane's hook and hanging dangerously over a barrel of steaming sludge. The Snorch tries to save her, but his mouth catches fire due to the voice box malfunctioning. When Ickis, Krumm, and Zimbo arrive, the Snorch throws Zimbo to Oblina, only for him to return feeling soporific as well. Ickis and Krumm waste no time in saving Oblina by running onto the catwalk and pulling the chain to the hook. Oblina regains consciousness when Ickis and Krumm return her to the Snorch, who with his final words, tells her "These are not your intellectual inferiors, these are your true friends."
At the end of the episode, the Snorch is distraught when his voice box is damaged beyond repair, especially when Zimbo tells him that Oblina only liked him for his voice box. Oblina then shows up and asks the Snorch if they're still on for their date, proving that not to be the case.
