You meet Eren for the first time when entering Top-Notch.
Eren Niden is not your average frontier doctor. She is an Indogene bio-technician specializing in xenobiology and nano-augmentation. As brilliant as she is, she has only recently left the Votanis Collective and has poor command of the English language. This, combined with her focus on research rather than medicine, has led her to have a rather strained relationship with her patients in Paradise. Her only strong connection is with her companion, Rosa Rodriguez, with whom she lives at Top-Notch Toolworks.