There are currently four Peely's in Fortnite: Original Peely, Banana Royale Peely, Agent Peely, and Metal Team Leader Peely.
Original Peely was the first of the bunch and was made available during Season 8. He's a regular banana with eyes and a mouth who wears green shorts. He's also the only one who can't be obtained through Battle Pass tiers. Instead, he must be bought from the Item Shop.
Banana Royale Peely was introduced during Season 9 and is part of the Battle Pass. He's a blue banana with eyes and a mouth who wears purple shorts. Unlike Original Peely, he comes equipped with a back bling called Banana Bunch.
Agent Peely was introduced during Season 10 and is part of the Battle Pass. He's a yellow banana with eyes and a mouth who wears black sunglasses and a black suit. Like Banana Royale Peele, he also comes with his own back bling called Banana Briefcase.
Metal Team Leader Peely was introduced during Season 11 and is part of the Battle Pass. He's a silver banana with red eyes (no mouth) who wears blue jeans. Unlike the other three Peelys, he doesn't come with any additional accessories or back blings.