Carbuncles are oval creatures with puffy ears and long slim tails with fur at the end. Their eyes are Amaranth with a round tiny ruby between them and the forehead. The Carbuncles fur come in two colors: white for the common ones, and pink only seen in familiars.
Carbuncles are cheerful creatures said to bring happiness to people.
Regular white Carbuncles have the power of the moon while the pink ones have distinguished special power.
On Elias' route, the white Carbuncles have shown ability to multiply themselves and a very fast magic.
- So far only Liz Hart and Randolph has had/have a Carbuncle as a familiar.
- In the Spin-off "Carbuncle Bungle" Liz Hart is transformed into a Carbuncle.
- Despite the East Forest being defined to have mostly dangerous creatures, Carbuncles were shown residing in this forest. This might be because of Randolph magic to protect the forest and his magic empathy with Carbuncles.
- Carbuncles resemble the character Mokona from CLAMP series.