Conversation so far:
What is the definition?
Melungeons have been defined as having multiracial ancestry.
Were they considered a certain race on their own?
They did not exhibit characteristics that could be classified as those of a single racial phenotype.
Were there more dominant characteristics?
They did not exhibit characteristics that could be classified as those of a single racial phenotype.
Has the definition changed?
Melungeon are generally European American in appearance, often (though not always) with dark hair and eyes, and a swarthy or olive complexion.
Has that definition be consistent?
in the 19th and early 20th century, they were sometimes identified as "Portuguese," "Native American," or "light-skinned African American".

Question: What are some of the other characteristics?
Self-contained rewrite: Other than being identified as "Portuguese," "Native American," or "light-skinned African American", what are some other characteristics of the Melungeon?