1.Illiterate character can still read book titles. Illiterate should have book titles replaced with ambiguous descriptions - “Some book”, “Some magazine”, “Some periodical”.Examination attempt should give similar vague description, since indywidual can comprehend only through indirect means, like watching illustrations.
Example:
Literate Illiterate
Under the Hood ->Book about cars, large colorful pictures.
What’s a Transistor? ->Lots of text, some schematics, nerdy.
2.Add Old Zombie or Geriatric Zombie - “Atrophied zombie of aged individual, weak and slow. You gonna feel guilty for killing it”. Large population at hospitals, some stay at homes, few wander the streets.
3.Animated skeleton is a fantasy BS. You might rename it Skinny Zombie or Gaunt Zombie -
“These specimen of zombie has shed most of its tissues and organs. Only bones, tendons and thin muscles remain”.
Zero change to stats, just semantics.