[Image Description: Fanart of teenage Luca, Alberto, and Giulia from "Luca," based off Kenna Jean Harris's fanart. Alt text is provided and copied below the cut. End ID]
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Image one: Luca and Alberto stand in the rain, looking happily into each other's eyes. Alberto holds an umbrella over the two of them, and Luca pulls Alberto close by his suspenders.
Image two: Giulia, soaking wet from the rain and carrying a suitcase, comes up behind them, saying, "Hey lovebirds! I'm home, too!" The umbrella tilts a bit, and the rain partially transforms the boys as they turn to Giulia, laughing.
Many people noticed that Giulia has similar clothes to Tombo from Kiki's Delivery Service
But Luca and Alberto also have outfits, strikingly similar to those of Conan from old Ghibli cartoon Future Boy Conan!
In most concept art, Luca is wearing white shirt, more closely resembling the one that Conan wore for some time
But in the movie, it has blue stripes, more similar to the one that on Fio
It was confirmed that towns name Portorosso - is a reference to Porco Rosso (It was also a second name of Luca in early concepts)
Could Luca's shirt be another Porco Rosso reference?
In my opinion, Future Boy Conan must've had a huge inspiration on Alberto character, not only his design, but also behavior, lifestyle and houses very similar!