Jimmy and Heloise's "R&B Soul Duet" in Misery Hearts is absolutely adorable and heartwarming. The fact Jimmy also spends majority of that episode trying to cheer Heloise up by finishing her story (even if he has no idea what he's doing) is also incredibly sweet.
The ending to Heloise's story is also adorable.
Similar to the above, the ending of Fused Together with Jimmy and Heloise cuddling together as a heart made out of fire surrounds them, is likely to produce a few squees from the audience.
The ending of Heloise's Secret Admirer, where she rides a spin-dashing Jimmy, saying in a somewhat satisfied tone of "I'll take what I can get", is par for the progress she's making with him, before the two crash into her trap wall. Both looking beaten up, she says that she just wants to stay right there is another sweet touch as the episode ends with a heart.
Beezy going to rescue Jimmy from the weavils in "Invasion of the Weavils" despite his fear/hatred of weavils.
"Catalogue of misery" Why does Jimmy do all of the Misery inc deliveries instead of return them? Because he doesn't want Heloise to lose her job and is worried about her.
Cerbee and Jazmeen finally getting to be together in "Cerbee in love" then its subverted.
Jimmy and Beezy are trying to scare away Heloise's hiccups, so they bring in a poodle rat thinking she'll hate it. It ends up chasing the boys and Heloise calls to the poodle rat and it runs up and licks her face. Heloise says he's cute and is gonna call him Bitey. Seeing a mean girl like Heloise be cute with an animal is absolutely adorable!
When Jimmy takes advantage of Lucius being unable to talk in "Happy birthday Lucius" Heloise says she is proud of him for being mean and hugs him.
Heloise's daydream of Jimmy saving her from the train tracks in "Air force none". She looks absolutely adorable clinging on to him.
Jimmy reuniting with his shoes in "Jimmy new shoes".
When Heloise is missing her head, Jimmy tells her she's still lovable.
Lucius and Granpa Heinous reconciling and admitting that the other is fun in "Six over seven"
Jimmy when he's wearing the love sweater in "Better sweater" he is very loving and affectionate towards Heloise and it is adorable! They almost kiss...again!
Jimmy: Heloise, I can no longer hide my feelings. I adore you.
He says he can "no longer" hide his feelings, hinting that he secretly has feelings for her.
Beezy forming a friendship with the Chief Weavil's son Brutus in "Weavil day", when they have to fight, Brutus admits that he can't hurt Beezy.
Heartwarming In Hindsight When Heloise tries to trick Jimmy in "Heloise's rival" he's not afraid of her, it's because she's his friend and he cares about her. Even when Mean Jean took him to her pool, he still wonders where Heloise is and when Mean Jean lies about her whereabouts, Jimmy says that it's so like her and brings out a picture of him and Heloise. It's cute that he would keep a picture of the two of them with him.
Heloise catches Jimmy when Jean throws him and the two of them team up to take her down. Heloise gets her trophy back and says that he, Beezy and Lucius say the sweetest things.
Cerbee realizing he truly wants to be with Jimmy in "Cerbee come home" Only Jimmy gives him hugs and affection. Cerbee comes back the next morning and licks Jimmy's face happily.
Strangely, Samy and Molotov going over for a bedtime hug from Jimmy.