Is it possible that if there was a full female Sayian on earth, would Goku fall in love with her, or will he still marry Chi Chi?
It is possible that if there was a full female Saiyan on Earth, Goku may develop feelings for her. However, Goku's relationship with Chi-Chi has been a central part of his character development throughout the series, and it is unlikely that he would leave her for another woman. Ultimately, Goku's loyalty and commitment to Chi-Chi would likely prevail in any situation.
What if she came to earth with him?
If a full female Saiyan were to come to Earth with Goku, it could potentially complicate his relationship with Chi-Chi. Goku may develop feelings for the female Saiyan due to their shared heritage and similarities in combat abilities. However, Goku is known for his strong sense of loyalty and commitment to his loved ones, so it is possible that he would still choose to remain with Chi-Chi and prioritize his family. Ultimately, the outcome would depend on Goku's own feelings and choices in the situation.
Would Sasuke most likey dated a female Uchiha if one was remaining?
It is likely that if a female Uchiha were to have survived the Uchiha clan's massacre, Sasuke may have shown interest in her. Being the last surviving member of the Uchiha clan, Sasuke values his heritage and connection to his clan. He may have felt a sense of duty to preserve the Uchiha bloodline by forming a romantic relationship with a remaining female Uchiha.
Additionally, Sasuke's bond with his clan and his desire for vengeance against those responsible for the massacre are integral parts of his character. If there were a female Uchiha survivor, Sasuke's relationship with her could have been influenced by these factors.
Ultimately, Sasuke's feelings and choices in the situation would determine whether he would pursue a relationship with a female Uchiha if one were remaining.