Adam

Adam Frankenstein was the first creation of Victor Frankenstein. He was a failed experiment and (from Adam's perspective) was shunned away. Adam, seeing his 'father' create Justine and love and swaddle her, and educate her, this sends him into a blind rage and filled with jealous bitterness. He warps her empowering speech into fuel for his own self-pity. He admonishes Victor for educating and caring for Justine, when Victor did not afford him the same treatment. Victor refuses to let Adam take Justine, but Adam is stronger – he strangles and kills Victor. Adam ultimately wants to remove Justine's brain so she can be subservient and remain his and his alone to bend to his own will. Above all he's desperate to have Justine love him. Adam went through his life feeling abandoned and swept under the rug compared to Justine from his Father Victor.

Edward Hyde, Diana's father is who comes to his daughter's aide in the final confrontation with Adam, Mary, Justine, Catherine, Beatrice and Diane. (Watson, Alice also being present) Adam had taken Hyde in and given him a place to stay and live and continue his research. Hyde being wanted, and homeless was able to live his life with the help of Adam Frankenstein. It was never Hyde's intention to be in league with Adam with his venture to hire Dr. Prendick and begin his experiments with beastmen. Hyde's own experiments and research was less nefarious and he even wanted to bring to light Van Helsing and the others who were using the Alchemical Society for purely heinous acts.