Cubaris is a genus of isopod that is quite popular among hobbyists. There are more than 100 described species, but quite a few of the popular "cubaris" are refereed to by their morph name, or have not had their species properly described/identified.
Examples of this are the popular "panda king", "rubber ducky", "white shark" and many others. In this case the full name of a morph would be "Cubaris spp. [morph name]". If the species has been identified we simple replace the spp with the (lowecase) latin name.
Cubaris generally have a more rounded shape, and posses the ability to conglobate, thus falling under the "roly-poly" common name, which they share with others of the Armadillidae family.
Their friendly and cute appearance has made them an appealing choice for new keepers. Many in these genus are relatively easy to keep and breed, but won't have their population grow at unmanageable rates.
Care and enclosure
As with all isopods providing a proper humid/hydration area is a must. Some Cubaris like their enclosure to be wet throughout, like "panda king" or "rubber ducky", but some will enjoy a dry arena to rummage in, the various C. murina morphs are a good example. Provide ventilation adequate to the humidity required for the species.
Smaller populations will stay hidden under the substrate, and it's best to avoid disturbing them during that period. With larger populations it's not uncommon to see them walk around the enclosure.
Food
The main food source should of course be the properly made substrate, rich in decomposing plant matter. A leaf liter covering is important too. Make sure that a source of calcium is present in the enclosure, be it egg shells, cuttlebone, or crushed lime. Some report having success with bones, but I suggest avoiding them as they might invite unwanted pests and diseases (plus they look gross)
As a supplemental food I've seem them eagerly consume dried shrimp, minnows, fish flakes, and oats. They absolutely swarm slime mold, but the work required to provide it in sufficient quantities makes it not viable, aside as an occasional snack. Interestingly dried fungi were mostly ignored, but live ones seemed to interest them, though they weren't consumed as fast as I would like.
Vegetables are eaten at a decent rate, but make sure to have springtails ready to eat up anything that starts to mold. Make sure the vegetables are clean and free of pesticides.