Seina is an attractive young woman in her late teens, with a tendency towards trendy clothing. Her hair is long and dyed a light color, in contrast to her dark-haired family.
Seina is a typical teenager, with an interest in fashion and spending time with her friends. She is easily annoyed, and yells at her brother for commenting on her trendy clothing and dyed hair.
- The name Seina means "holy" (聖) (sei) and "apple tree" (奈) (na).
- Seina's surname Takizawa means "waterfall" (滝) (taki) and "marsh" (澤) (sawa/zawa).
- Ironically, Seina attends the same private university as Shuu Tsukiyama, the Ghoul once being investigated by Seidou Takizawa.