| A | B |
|---|
| Mentor | source of wisdom, gift giver, and conscience |
| Threshold Guardian | ensures the protagonist is worthy of passing the threshold |
| Herald | invites the character to answer the call to adventure |
| Shapeshifter | acts to bring uncertainty and tension into a story |
| Shadow | the villian or the unexpressed, hidden or suppressed side of the hero |
| Trickster | clownish sidekick or the hidden troublemaker |
| Mazer Rakham | Ender's mentor |
| Col. Graff | Ender's herald & early mentor |
| Peter | Ender's shadow |
| Valentine | Ender's shapeshifter |
| Bean | Ender's trickster |
| Bonzo | Ender's second threshold guardian |
| Bernard | Ender's first threshold guardian |
| Guinevere | Arthur's shapeshifter |
| Merlin | Arthur's mentor |
| The Sword in the Stone | Arthur's first herald |
| Mordred | Arthur's shadow |
| Lancelot | Arthur's trickster |
| The Holy Grail | Arthur's second herald |
| Sir Uriens or the Black Knight | Arthur's threshold guardian |
