His design is meant to be a longer green version of Mario with differences, like a different mustache and the shirt and the cap being green, as I said in both the english and Japanese version of my Marie worshipping (not really much of a) shitpost (which is basically episode zero of Brice Talks), green characters are often forgotten or have a big fanbase. Look at that Marie story I made for the list of examples again.
In his earlier appearances and other appearances, he was just a pallet swap of his older and popular brother, Mario (Many people give Luigi the insult nickname of "green Mario" because of this stunt from Nintendo) he also has the colors of Fire Mario in SMB1 and The Lost Levels. But from the start of Super Mario Bros. 2 (The USA version), He finally had his own artwork, sprite that makes him stand out. In The Lost Levels and SMB2, He has the ability to jump higher, but also has some ice physics when he skids. Personally I don't have this problem when I play with Luigi, I have been playing as him for many years that he is my go to guy when I play Super Mario games.
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Brice Talks: Gushing about Luigi
RandomHere comes the boy~... "Luigi is love, Luigi is life" - probably from someone on the Internet. Welcome to probably my shortest Brice Talks yet... Because there is a reason for that which you'll find out...