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|voiced by = Josette Jorge

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'''Monica''', also referred to as '''Ghost Girl''', is a minor character that appears in ''[[Bakugan: Armored Alliance]]''. She is a ghost that debuts in the episode ''[[Haunted House]]'' of the second season. She had a [[Haos#Generation 2|Haos]] [[Sairus]] in life and in death, but later it was given to [[Lia Venegas]].