For anyone interested, here's the list of heritable traits and where to find them as of 0.3.04:
| Trait | Creatures | Max |
|---|---|---|
| Max HP+ | Human, Dwarf, Beast, Angel, Demon, Slime, Green Slime, Mother Bulb, Cowgirl, Taurus, Mother Slime, Alraune, *Unknown* | 10 |
| Max MP+ | Elf, Angel, Demon, Mother Bulb, Dark Matter, Succubus, Incubus, Alraune, *Unknown* | 10 |
| ATK+ | Human, Dwarf, Beast, Weretiger, Werewolf, Taurus, *Unknown* | 10 |
| MAT+ | Elf, Angel, Demon, Dark Matter, *Unknown* | 10 |
| DEF+ | Human, Dwarf, Slime, Green Slime, Werewolf, Cowgirl, Mother Slime, *Unknown* | 10 |
| MDF+ | Elf, Angel, Demon, *Unknown* | 10 |
| AGI+ | Human, Elf, Beast, Weretiger, *Unknown* | 10 |
| LUK+ | Human, Dwarf, Beast, Succubus, Incubus, *Unknown* | 10 |
| EXP+ | Human, Elf, Dwarf, Beast, Angel, Demon, Mother Bulb, Alraune | 10 |
| Lifespan+ | Elf, Angel, Demon | 10 |
| Fire+ | Human, Succubus, Incubus, *Unknown* | 10 |
| Water+ | Elf, Slime, Green Slime, Mother Bulb, Dark Matter, Mother Slime, Alraune, *Unknown* | 10 |
| Ice+ | Dwarf, Slime, Green Slime, Mother Slime, *Unknown* | 10 |
| Earth+ | Dwarf, Werewolf, Mother Bulb, Cowgirl, Taurus, Alraune, *Unknown* | 10 |
| Wind+ | Elf, *Unknown* | 10 |
| Thunder+ | Human, Weretiger, *Unknown* | 10 |
| Light+ | Angel, Weretiger, Cowgirl, Taurus, *Unknown* | 10 |
| Darkness+ | Demon, Werewolf, Dark Matter, Succubus, Incubus, *Unknown* | 10 |
| Ear+ | Werewolf | 3 |
| Sight+ | Weretiger | 3 |
| Fast Pregnancy | Green Slime, Cowgirl, Mother Slime | 5 |
| Fast Growth | Weretiger, Werewolf, Mother Bulb, Taurus, Alraune | 5 |
| Gathering | Elf, Cowgirl | 10 |
| Fishing | Human | 10 |
| Double Attack | Beast, Werewolf | 1 |
| Tiger Stance | Beast, Weretiger | 1 |
| Charm | Succubus, Incubus | 1 |
| Sex Drain | Succubus, Incubus | 10 |
| Masochist | Mother Bulb, Dark Matter | 1 |
| Lust | Incubus | 10 |
| Voyeurism | Alraune, Mother Bulb | 10 |
| Beauty | Mother Bulb, Alraune | 10 |
| Sluttishness | Succubus | 1 |
I think dwarves are supposed to be able to inherit the mining trait, but there seems to be a typo in its ID in 0.3.04 that causes a blank trait to appear instead.