Tomoko Higashikata

Tomoko Higashikata (東方 朋子) is a minor character from Part IV: Diamond is Unbreakable. She is the mother of Josuke Higashikata, the series' protagonist.

Appearance/Personality
An attractive single mother practicing a teaching profession, she is known to have a strong temperament. When Jotaro visited looking for Josuke, she breaks into tears and hugs him confusing him for Joseph, her old affair she remains deeply in love despite the man already being married and becomes emotional at the memory of him. She is also fond of a particular sponge cake from Kamakura.

History
Little is known about her before the events of Part IV. She had an relationship with Joseph Joestar when still in college. The 62 year old man, however, was married with Suzie Q, and so Tomoko didn't tell him that she was pregnant with his illegitimate child, Josuke Higashikata, of which Joseph had knowledge of only when the boy was 16. When Josuke was developing Crazy Diamond and became ill, she drove in the snow to take in to the hospital, their car being saved by a high school student with a pompadour, who had thrown his coat under the car, allowing it to plow through the snow.

Diamond is Unbreakable
Tomoko is introduced as a short-tempered woman, assaulting a man who offered a ride to her. She then receives the visit of Jotaro Kujo, who she mistakes for Joseph and hugs. In tears, she confesses her love for him, but backs off bewildered when Jotaro lets her down that he isn't Joseph. She takes a long time to change Ryohei Higashikata´s bedroom, depressed of his death by a brain tumor (which was actually the doing of Aqua Necklace).

Later on, she is attacked by Terunosuke Miyamoto, who invades her house and turns her into paper with his Enigma after seeing her sign of fear: swallow her own saliva. Terunosuke then used her to see Josuke´s sign of fear, but was defeated by Josuke and Yuuya Fungami and Tomoko was saved.

The Book: 4th Another Day
(The information below derives from a Light Novel not written by Araki. As such, it may or may not be consideredcanon.)

Tomoko is accidentally attacked by Takuma and retains serious injuries, making Josuke confront him about it.

Steel Ball Run
Tomoko's counterpart in the Steel Ball Run universe is the mother of Norisuke Higashikata IV, who was given the name "Josuke" at birth. However, she married Norisuke Higashikata III and into the Higashikata family from the outside. Her husband's birth name is "Joshou", which bears similarity to the first name of "Joseph Joestar".