I really like the ideas of wasps or termites, especially their ability to create (extrude/spit out) bases with basic cellulose. Below are just some of the ideas of possible branches for each archetype.
Bee (Insect)
Honey Stomach (or, insectoid crop):
“You’ve developed a secondary layer to your stomach dedicated to the collection of simple sugars. At a cost of nutrition, you may regurgitate honey for later consumption or use as an antimicrobial salve.”
Bristled Exoskeleton:
“While useless in terms of attracting pollen, these fine carapacial extensions do manage to retain precious body heat.”
Hypopharynx Gland (requires Honey Stomach):
“By consuming large amounts of honey, you are able to stimulate the secretion of royal jelly (at a 5:1 ratio). Although this involves ‘eating,’ this is considered a (secret) crafting process.”
Antennae.
Insect wings.
Scorpion (Arachnid)
Chelae:
“Your arachnid arms have evolved into great chitinous pincers, capable of performing two additional cutting attacks during combat. However, you no longer receive a bonus to climbing.” (Should be fun with Mandible.)
Regenerative Molt:
“Damage to your exoskeleton is slowly repaired by means of successive molting.”
Wasteland Adaptation:
"Your specialized digestive tract reduces the loss of essential nutrients and fluids; they increment less frequently. Also, like cockroaches, you are nigh-immune to radiation.”
Burrowing.
Very Strong (as opposed to spider’s very dexterous).
Spiked tail (moved from insect).
Bat (Rodent)
Bat Ears:
“Your aural perception is unsurpassed, and you can detect moving creatures with pinpoint accuracy (x6 modifier). However, large sounds have a greater chance to deafen you.”
Echolocation (requires Bat Ears):
“By pressing ‘E,’ you release a near-ultrasonic chirp (2 sound) that reveals the surrounding environment for one turn (equivalent to a flashlight).”
Vampirism (requires Incisors):
“Whenever butchering a corpse, you gain a small amount of nutrition.”
Narrow Bones (equivalent to hollow bones).
Bat wings.
Extremely Dexterous.
Extremely Perspective.
[ Variants That Demand Less Coding…I Hope ]
Tortoise (Reptile)
Tortoise Shell:
“Your thick skin has expanded into a near-impenetrable shell, ranging over the length of your torso. It provides substantial resistance to bashing (12) and cutting (28) but reduces your dexterity by 2. You may pull your body inside the carapace for shelter and warmth when activated (a la Roomy Shell; no storage space). (Hero in a half-shell!)”
Snapping Jaw (requires Snout; identical to Reptilian Muzzle).
Hibernation (yep, they do).
Very Strong.
Very Smart (more so than rats in reality).
Extremely Ponderous.
Omnivorous (not a trait; just differs from lizard’s ‘Carnivore’).
Vulture (Bird)
Disease Resistant (stomach acid studies).
Saprovore.
Strong Stomach.
Carnivore.
Very strong.
Gourmand.
Culling.
Hyena (Feline) – Closer to cats than dogs, at least…(Gnolls!)
Hyena Muzzle (identical to lupine muzzle).
Extremely strong.
Apex predator.
Saprovore.
Strong Stomach.
Gourmand.
Light Step.
High Adrenaline.
Shouter.