So before I get started with my rant I want to tell you all that canonically Hojo is Sephiroth’s father and this rant is to prove that Professor Hojo did father the General.
Two people have a baby. The baby doesn’t have to look like the parents. The parents of the child have inherited genes from their parents. Genes also can be recessive and dominate. The way that a child looks is influenced by their genes and if they are dominate or recessive.
Sephiroth has a very similar face shape to his mother. However, his features are more manly. Which could be from his grandfather on Lucrecia’s side. They share the same features. Hojo has a strange face. His nose doesn’t sit quiet right and his lips are a little too large. However, it makes him look human because not all humans are perfect. You can look at Hojo and Sephiroth and see that they share some features like a harsher jawline, the lip shapes, and arguably part of the nose as well. You’d need to look at the the family background to really see how genetics work in a family. However, sadly we never met any family on Lucrecia’s or Hojo’s side.
However, Sephiroth may have gotten most of his features from his grandparents. Though Sephiroth looks more like his mother. However, may I stress that all embryos start out as female and harbor more of the mother’s genes when you have a boy due to the Y chromosome not carrying that many genes.
Jenova had a big influence on how Sephiroth looks. His hair color, eye shape, eye color, and height were all influenced by Jenova. Sephiroth was injected in uretero. The Jenova cells were able to become a part of Sephiroth, they grew with the baby. Sephiroth took on many of Jenova’s features because of this. However, Sephiroth’s height and the way that he might have grown could be because of Jenova, Growth Factor Hormones, Mako, and a cocktail of other chemicals. Sephiroth’s disposition and attitude was because of the abuse that he suffered in the science department. Sephiroth was mentally abused. His attitude was learned, he didn’t inherit it from Vincent Valentine.
May I also add that Jenova was only a threat when she was inside a body. She had to have a host. If she was left in the crater she would have remained dormant. She needed a body to become malignant.
Unlike Sephiroth, Genesis and Angeal were injected before they were in a living body or were injected while a small child. They were injected differently than Sephiroth, the Jenova most likely never integrated correctly causing the degradation. It was most likely because they were injected incorrectly. The only way to be injected correctly with Jenova would be in uretero. Yes they had her features, like the wings, but she was more likely a tumor and not completely intergraded or a part of them. She was poisonous to them and they began to degrade! You could argue that she was almost like cancer. Genesis degraded worse than anyone else due to the way that he was injected. Genesis was injected in a test-tube. He had no body, he was simply cells when he was injected. Angeal I suppose was able to integrate the cells better because his body was able to deal with the cells, and Sephiroth grew with the cells.
The Lifestream emerged to push the Meteor back. Because some parts of the Lifestream had been infected with Jenova cells the people who came in contact with this tainted Lifestream contracted Geostigma. The disease is not contagious, but is believed to be so. Rufus must have come in contact with the infected Lifestream. It took a while for it too recede, but eventually it did. For him to become Geostigmatic he would have had to touch the lifestream that was infected with Jenova cells. This goes along with my cancer theory of Jenova reacting poorly in a body. Jenova was malignant. There is a lot of talk on how people contracted stigma and how it affected people. Now that I’ve done a bit of research I can say that NO ONE was immune, however people in the slums were more susceptible to it. It was a disease and how it affected them based on their immune system.
Sephiroth is Hojo’s kid.