[Snake]

Soulless Physique
A clear lack of blood, mind and spirit possessed by beings that are often manipulated by other forces.

Grants immunity to Poison, Confusion, Fear, Hesitation and Charm. Treated as a Boss monster for the purpose of immunities. (Additionally, "Bite skills" such as Banquet, Argent Bite, etc. will deal 50% less damage and their special effects will be nullified.)

This should be given to Machines, such as Engineer bots, Undead/Ghost enemies such as Bone Rex, Souls Tainted by Darkness, Ghost Dog, Headless Knights and more.

Extra Thiccness
This boy's big. Bigger than your arms can wrap around, or your force can shove about.

Grants immunity to Knockback and Draw-In effects, and Vydel's displacement. Cannot be targeted by Grapple. Reduces Move by 2.

This should be given to large enemies, such as Feathered Serpent, Ice Giant, Fenrirberus, etc. Perhaps some Ascended Youkai too.

Any more ideas of 'Dev Logic' that should be addressed through racials? Feel free to add here!