At Last, An Easy Way To Distinguish Them.

At last, an easy way to distinguish them.

Bisco Hatori’s tip for distinguishing the twins.

It's probably not my place to say this since it seems you've taken a psychology class (and I haven't) but I've always identified Kizami as as psychopath not a sociopath.

Sociopaths have no emotion and usually aren't serial killers. They don't have compulsions to kill, they just happen to not have the empathy capable of making them care if they do.

Psychopaths have no grasp of morals and, as such, are much more prone to compulsive killings. Also, he showed emotion like anger and his twisted "love" for Yuka. A sociopath doesn't feel.

I think Kizami’s parents were irresponsible if not neglectful to Kizami. according to my Psychology class most Sociopaths, such as Kizami, are ABUSED or neglected as a child. That should say something about his family. They knew he had a problem and from what I can gather did nothing to help him. They just scolded him and then gave up. They did not take him to a therapist, or a psychologist to get him treatment. It is THEIR fault that he is the way he is.

Aya Drevis from Mad Father and Ms Library from Misao look very similar. They have other similarities too:

Both games are made by the same man(so a connection is possible)

Ms Library mentions her father is a scientist. Aya's father is also a scientist.

Aya's clone presumably goes to live with her scientist father and Ogre. Ms Library is seen living with the same arrangements(a scientist father and Orge/Onigawara).

Both Aya and Library have homicidal tendencies 

They both like to read

In Misao, the man who comes in to kill the bully(when you hide in the intestines) looks like Aya's father Alfred with purple hair. He even has a chainsaw.

Also, the bully mentioned that she doesn't want to be, "tested on" by him. That hints that he is a scientist who may very well be Ms Library's scientist father. Quite a coincidence for two scientist fathers to look so similar.

If he was Ms Library's dad then that was probably his lab. He has the exact same test tubes in there that Alfred does in his own lab.

Ms Library had the book "The Red-Eyed Stranger" on her shelf. Aya has the exact same book. It is even read to her in her game.

The music playing in Library's well... library is the same music that plays at the end of Mad Father.

All this doesn't include Version 3 which hints much more strongly to it(but, as it was made after the fan theory, the 3rd version was probably adjusted because the creator liked the idea).

Vexen actually looks kind of peaceful with his eyes closed. Kind of.

I was thinking of when Vexen met Roxas in Days when Even said that to Ventus.

remember when

^THIS right here is Attack on Titan summed up in three panels.

never mention his mom