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She has black hair, blue eyes, and wears glasses. Her normal attire consists of a brownish red jacket over a light blue shirt and a light brown skirt.
During the wedding ceremony, she wore a red dress.
Betty Jean, like Gordon, are stiff and traditional people. They were not in favor of their son marrying a Lenopan, but in the end they supported Joel.
In Big Fat Alien Wedding, her son Joel became engaged to a Lenopan, named Camille Mann (a union which would put an end to a decades long feud between the Sludges and the Plumbers). Both she and her husband were against the wedding at first (due to Camille being a Lenopan), but later realized they had treated her unfairly and apologized, accepting Camille as their daughter-in-law.
- Big Fat Alien Wedding (first appearance)
She was named after her voice actress, B. J. Ward.
- Betty Jean is one of few known female members of the Tennyson family who is a member of the Plumbers.
- Manny Tennyson was mentioned in Gwen 10, a non-canon episode. It is unknown if he exists in the canon timeline.