I'm claiming Fujiwara no Mokou from the Touhou series to be my second companion.
To be portrayed as a cold, detached person which the concept of time and death removed from her, i've always wanted to see the humanly side that she seem to have lost. Maybe... Just maybe, she chose to be so because eventually everyone and everything will leave her by the cruel grasp of time. I'm not immortal, but i still want to be with her till then to help her become the human that she once was.