Little Fishlegs is probably the ONLY person in the entire tribe to think Hiccup the Elder was cool from the very beginning 😂
Elder has the same dark sense of humor as him, is lethally sarcastic, and was also an outcast from his peers for a long time, so Little Fish sees him as sort of a role model. WAY more so than Minicup, who finds this preposterous and heartily criticizes his standards 😂😂 but he'll come around eventually!
Elder has a soft spot for Little Fish, too. He fixes Fish's glasses when they get screwed up by the other Pirates and he'll give him and Minicup advice on how to make bullies leave them alone. He considers Fish an extension of the family to some degree, and therefore considers him his responsibility, alongside Minicup. If you've seen the shows, you know this guy is a bit of a mother hen!
Minicup and Elder butted heads a lot all growing up, and don't have a truly close relationship until they start training dragons together. But Little Fish and Elder have always been on good terms!