History of Baymax and Hero
Hero was a 13 year old boy playing in robot gambling then when his brother died of an explosion that was caused by a man in a mask, he started training the robot his brother made for revenge. After training Baymax with the help of his friends, he went after the man in the mask. When Hero's team beat the man in the mask Baymax sadly had to be sacrificed to save Hero. But at the end he was able to be remade.

                                      History of Goku
Kakarrot was sent to earth originally to destroy it but he went through head trauma which erased his memory and turned into a friendly kid. After crashing on earth, a man named Gohan who named him Son Goku. While learning martial arts, he has been figuring out his powers and after Gohan told him not to, he disobeyed and looked at the full moon. When he did, he turned into to a giant great ape and accidentally murdered his adoptive father. After that happened he raised himself in the mountains. While walking, he encounters second human ever named Bulma  helping her find the dragon balls. On their adventure he finds  man named Master Roshi who trains him further into martial arts. During their training Roshi gives Goku a Nimbus cloud who can fly a pure-hearted person anywhere they want. As Goku trains with Roshi he meets a new friend,Krillin, who gets killed by Piccolo and gets revived by a dragon. For revenge Goku punches a hole through Piccolo. During Piccolo's last breath he produces a egg that is Piccolo jr. Leaving he trains with Kami and Mr. Popo to fight in a tournament. After winning the match he marries a women he met during his traveling(Chichi) and having two sons, Gohan and then Goten.  

















                                                                 Goku 
Roshi

Piccolo jr
Krillin
Piccolo
Bulma

Goku and Bulma
Gohan(the one in purple) and Goten
Gohan(the on who raised Goku)
Kami
Mr.PopoNimbus

                                    History of Harley Quinn

Harley was working as a intern in Arkham Asylam. When she discovered The Joker she became very interested in his insane and volunteers to analyze him. During the session Joker is telling about his terrible past and how his father abused him and Harley quickly gains sympathy for him as well as falling in love with him. Harley helps him escape in her now known costume and become's Joker's love interest also being his sidekick. Later Harley finds out that everything Joker had told her was a scam to endear himself to her. Harley tries to run away but keeps coming back and forgiving him. Through out their relationship she has been abused and used by Joker but she is always loyal and will be right there when things go wrong. Just as cruel Joker is to Harley he also shows affection towards Harley.

Joker