Toaster is generally absolutely adorable and does huge smiles at almost every chance she gets.
Lampy letting himself get hit by lightning to supercharge the battery, allowing the others to survive. He doesn't die but his bulb is shattered and is clearly in pain the next morning.
And then there's the Radio, whom Lampy fights with the most, giving one of his broadcasts about him receiving a purple heart for his efforts. In complete Sincerity Mode.
After the appliances escape from Elmo St. Peters' shop, they are overjoyed to be on the road again. They pause as they overlook the "City of Lights". Against all conceivable odds and through the most intense and breaking experiences that could have destroyed any semblance of friendship any group of friends could possibly have; they made it together.
Combined with some of the most joyous and heartwarmingly triumphant music this scene could have possibly ever had, Lampy's single line, his subsequent whoop for joy and Blanky's touching, silent moment as he takes out the Master's photo and hugs it seals the deal in terms of Tears of Joy
Lampy: Wow (The appliances go down the hill)
While the other appliances are all dedicated in their own right to find the Master, few are as devoted to finding him as Blanky. Near the end when the Master finds them in the dump Blanky is the first one he spots and what does he do? He snuggles him like he was a kid again. Given how much crap the gang had gone through at that point and how much emphasis has been placed on Blanky's love of the Master, it's not hard to imagine how Blanky must have felt at that point.
In the Polish dub of 'City of Lights', Lampy's line as they're going through the tunnel is "When darkness is all around, I'll beam light". It fit well with the scene and it's a sweet translation from the original line as well.