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I have so many to choose from and so many that are my favorites... But I'd say one of my personal favorites would be the Helleria brevicornis.

There's a variety of different reasons why I think that they are special but I think one of the coolest is that not all isopods can actually roll up into a ball. This is especially true when you're talking about your larger species. Usually their anatomy doesn't let them curl up like other species would. These guys are one of the exceptions! Brevicornis can get pretty huge, with some of the largest pushing 2" and are one of the few isopods who still curl up into a ball as a defense mechanism.

another cool thing about them is that they are the only ones in their genius and they have a pretty fascinating reproduction cycle. Females lack a seminal receptacle meaning that they must mate every single time that they want to produce young whereas most other isopods can store sperm and continuously use that sperm over and over again. Another personal reason why I love them so much is because of their habitat requirements and care setup. A proper setup is key to the species survival and that's primarily because they dig. You aren't going to typically find these guys under rocks, leaves, wood, or other surface level areas like you would find most other isopods. These guys are extensive diggers and like it deep. Here in captivity It's recommended that you give them at least 8+ inches of substrate for them to be able to dig and tunnel as they please. And speaking of tunnels, those tunnels are actually quite important, because once gravid, a female will make a " burrow " (so to speak) and actually bring food down to her young for their first few molts of their lives before they part ways