Which character should get the next origin story?

These are the remaining ODST characters of Taskforce 434 that need origin stories then I'll get to work on three bonus origin stories. The first origin story being on three spartans, Dogma, Archangel, and Lucifer, (I posted a few pictures of Lucifer a while back they aren't that great but it' something.) In this story there will be flashbacks from Lucifer's old team, (Before the 434 and before he was with Dogma and Archangel). The second story will be on Jen and her marine squad, (Jen is a friend of Ghost she was also mentioned in Ghost's story, A Ghost Story, and this will be her and her squad mates origin story) This story will also have flashbacks on how Jen met Ghost while she was with her old team. The third story will be on a mystery character that I'm really excited to show you all! I can't say anything about his story other than the main character is a he, so I hope you end up liking his story.