Cubs are bears in the making (I know, how creative right?) Just like in good ol’ nature, Cubs are going to be smaller, younger and have slightly less hair (usually) than their Bear counterparts. It’s not uncommon to see a Bear & Cub couple either (kind of like a Daddy/Twink situation.)
The Otter label is either newer or just a lot less known than the others. There are also a couple differing opinions on what this means… but essentially it’s a sub-category of Bears. Otters are thinner, but still rock the full-out body hair. They will usually be furry versions of twinks (but can be sometimes confused as cubs, but cubs are usually stockier.)
The Bear is the polar opposite of the Twink. Bears are large and in charge, wouldn’t dream of shaving ANY of their body hair. Large and jovial, these beasts range from muscle-daddy to Sumo wrestler, are generally a little older and are usually some of the nicest guys you’ll ever meet. An older bear can become a Polar bear or Silver bear based on hair color.