LogFAQs > #974998637

Here is the second to last party member. Apparently needs to be a robot. Here it is. Robots are Xenoblade's thing so she gets more of a story.

Her name is something decrepit sounding like Persephone or Bellona, really just flip open a mythology book to a random page.
She's a combat-ready cyborg nun from an ancient cult and she was in stasis for a long time.
Long blond hair, blank expression, weird luminous teal eyes, mechanical from the neck down, conceals her appearance with dark blue robes. No headdress.
She is actually an ancient supercomputer that barely survived the world being reset.
The new world does not contain the things necessary to repair her and she is rapidly degrading.
She is using the cyborg avatar (one of the few things new machines she's compatible with) to try and bring someone to her physical location and preserve the important data and has collected before it's too late.
She has a quiet voice, a thick Scottish accent and sometimes there's static when she talks.
The party members give up trying to understand her pretty quickly.
She joins the party about halfway through, she sees them losing to the villains, takes off her disguise and exhausts a lot of her energy to save them.
You know that thing people do on the playground where one crouches behind someone and another pushes them over? Aloysius keeps getting people to help him push her over like that.
Her fighting style is OP melee combat but it's like Sharla's gun, she needs to stop and cool off often.
After her legs get severely damaged in a fight, the guy on the stretcher groans that she'll just slow them down and that they should abandon her.
The party ditches her and she runs out of energy for good shortly after.