This is Sev.
Counterclockwise, starting from the upper left:
Daniel Jackson from Stargate. This is a pic of him while he was ascended, about to fire a beam of light energy at Anubis. He was in way over his head, of course, but he tried anyway, unbalking, just as Sev might be on the peculiarly frequent occasions when she might have been the last one alive in a raid against Magmadar, or Thorim, or somesuch. Once against Leotheras, her additional two seconds of survival actually allowed some old dots to tick over and kill the fellow, but mostly she just was stomped into the ground. As Daniel Jackson was. Repeatedly. He died, like, what, five times? Sev seems to have died a lot too. Sevrea shares with Daniel Jackson what could be called a flaw, in that she tends to focus on one part of a problem and overthink that one angle to the exclusion of a more practical immediate solution, while believing she's enriching everyone by looking at the Big Picture.
Esme "Granny" Weatherwax, from the Discworld. This is actually one that I've only started thinking about recently, but might be inclined to draw from more now that Sev's human again. The "witch" theme, as it stands in the Discworld series anyway, seems to mesh better with humans, in my mind. They're so marvellously practical, sometimes in impractical ways.
Pa'u Zotoh Zhaan, of Farscape. A priest herself, usually calm in the face of danger, and always thoughtful, considering all sides of a conflict.
The Nameless One, of Planescape:Torment. Sevrea was amnesiac for a large portion of her time as a Forsaken, and one of her main enemies was quite similar to one of this guy's. Don't want to provide too much detail here because I'd hate to spoil Torment for people. It's a great game, at least, if you can work the magic necessary to make it compatible with your modern PC, and if you can tolerate 14-year-old game engines.
Ambassador Delenn, of Babylon 5. In her more mature years, she was unflinching in service to light and goodness, even when it was dreadfully impolitic. Also good lord Mira Furlan smiling still gets me. I thought about putting Danielle Rousseau on here too, but two Mira Furlans might be a bit overkill.
Mathiu Silverberg, the original Strategist, from Suikoden I. Not the leader or director of the nation, but the intelligence that allowed the leader's army to overcome overwhelming odds. It is not simply that Mathiu values intelligence, but, on top of that the creative cleverness required to piece together the available elements in the world, leading to victory.
The background is the hell of Annie Collins-Nielsen in What Dreams May Come. This is very similar to the mentally-projected stage where the consciousness that is known as Sevrea encountered the consciousness that is primarily known as Ra'ix, the dalaran spy that infected herself with death plague in an attempt to infiltrate the scourge -- an attempt which failed when the body ended up rising as a Forsaken rather than under the domain of Arthas.