Races

Sense is nonsensical and you are not constrained by what some would consider normal laws of biology. If anything, the very nature of this land is encouraging you to bend those laws. Basing your character on puns is encouraged.

Humans do exist in Nonsenscia but any who have been there for more than a few days often develop bizarre personality traits or body mutations that certainly make them seem less human. Examples include the man who can't say nouns, except for the names of fruit, the woman who can only look just slightly to the right of the person she's talking to and John, we don't talk about John.

Nearhumans are like humans but not quite. Many resemble creatures from fantasy and mythology like elves, orcs or animal-human hybrid races.
If playing 5e DnD, then use whatever statblock fits best, the lore does not matter (Custom Lineage is permitted).

Nonhumans are creatures that don't appear even slightly human. Examples include Slippy the walking fish, Sir Raspberry the Blueberry and Entroy the floating burrito. For the sake of mechanics, your creature should still have the same basic limbs and abilities as humanoids (e.g. two tendrils or hand-like appendages for using weapons).
If playing 5e DnD it is recommended that you use the Custom Lineage race to make a character like this.

If playing Cogent Roleplay, the races offer no distinct penalties or advantages to others, these parts of your character should be handled by attributes, skills, vocations and proficiencies.