Glossary entry (derived from question below)
English term or phrase:
a rogue vampire
Spanish translation:
un vampiro descarriado
English term
Spain
Reliable and fast
Native in: Galician 
, Spanish
Works in: English to Spanish, French to Spanish, Portuguese to Spanish, and 9 more.
a rogue vampire
según la explicación que dan aquí pensaría que más que "malvado" se trata de un vampiro renegado o algo así.
¿Qué os parece?
Gracias
http://answers.yahoo.com/question/index?qid=20080601231614AA...
Proposed translations
United Kingdom
I read the Alethiometer
Native in: Spanish
Works in: English to Spanish, Spanish to English, French to Spanish, and 1 more.
un vampiro descarriado
Mexico
Postgraduate degree in Translation
Native in: Spanish (Variants: Latin American, Mexican)
Works in: Swedish to Spanish, English to Spanish, Spanish, and 1 more.
Sinvergüenza
Argentina
Reliable and professional translations
Native in: Italian (Variant: Standard-Italy) , Spanish (Variant: Latin American)
Works in: Italian to Spanish, Spanish to Italian, English to Spanish, and 2 more.
un vampiro villano
un vampiro solitario
renegado también me gusta, la idea es que actúa sólo, no como los demás.
un vampiro rebelde
Spain
Golf, Literature and Religion Specialist
Native in: Spanish 
Works in: English to Spanish, French to Spanish, Spanish
vampiro díscolo
un miserable vampiro
Saludos y espero que sea de utilidad.
Diego.
United States
Excellence, honesty and punctuality
Native in: Spanish
Works in: English to Spanish, Spanish to English
Discussion
In this case, "rogue" would usually mean either "vagabundo" or "rebelde", in the sense of separating himself from the main group...