Shouichi Makise, publicly known as Dr Nakabachi, was a scientist researching in the field of time-travelling. He is later revealed to be the father (and attempted killer) of Kurisu Makise and is one of the main antagonists of Steins;Gate.
Nae Tennouji, is the only daughter of Yugo Tennouji. She is a young girl who lives in fear of Rintaro Okabe/Hououin Kyouma.
She is a minor antagonist in Steins;Gate, and appears as a side character in Steins;Gate 0
Yukitaka Akiha is the father of Rumiho Akiha (a.k.a Faris NyanNyan).
His family owns a large area in the downtown districts of Tokyo, hence "Akihabara".