Ickis and Krumm comforting the heartbroken Oblina at the end of "Smile and Say Oblina". Always makes me go "Awwww..."
Ickis bonding with a human baby in one episode.
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.
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.
In "A Friend Indeed" Ickis bonding with a monster named Plastoog who was ostracised by his peers from the Academy many years ago because he had a human face, he only had one friend at the Academy and that was The Gromble
The Gromble and Plastoog reuniting 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.
The end of the ep "Blind Love, Monster Love"
Ickis: Nobody's perfect but you were pretty close.