All of the stories are Doctor Who fanfic, so instead of listing the fandom, I listed the characters in the story. I skipped over "Four Horsemen", because it's a collection of four drabbles and because of the restrictive wordcount, the stories are constructed differently than my usual work.
List the first line of your last 10 published stories. See if there are any patterns yourself, or have other people say what they notice.
“In here!” hissed Jamie, beckoning with one hand as he pointed into the ruined cottage with the other.
- "The Height of Heroism", Second Doctor, Jamie McCrimmon, Victoria Waterfield
The moment the door whooshed open, Strackman Lux hopped out of the hoverlimo without waiting for the steps to extend from chassis.
- "Eclipse", Strackman Lux
BOOM! Three seconds after the distant blast, a sparkling flower of crimson bloomed in the night sky, accompanied by the crackling of a thousand bursting packets of powder.
- "Two Quarks", Tegan Jovanka, Vislor Turlough
The Doctor planted the head of her shovel into the ground next to her and leant on the handle as she surveyed the little vehicle poking out of the rust-red sand.
- "The Opportunity to Finally Return Home", Thirteenth Doctor, Ryan SInclair
He doesn’t move as well as he used to.
- "The News Agent", Wilfred Mott
I was there when the Doctor returned.
- "Legends and Lies", Fifth Doctor, Tegan Jovanka, Vislor Turlough
Jack gazed out at the absolute nothing beyond the police box doors.
- Jack Reckoning, Thirteenth Doctor, Jack Harkness
The crowd cheered as the last of the invading soldiers fled up the loading ramp into the hulk of a spaceship.
- Ace in the Hole, Seventh Doctor, Ace McShane
The two guards snapped to stiff attention as General Bantoff burst through the door, their eyes straight ahead as they tried not to attract his rage.
- Caged Bird, Third Doctor, Jo Grant
The moment the estate office door slammed behind him, Mickey strode off toward the stairs, the flapping papers clutched in his hand punctuating his angry stomps.
- Eight Months, Mickey Smith
In general, my first lines tend to establish the scene, and sometimes the mood, rather than introduce the characters or the theme. They are also very pragmatic, not particularly evocative nor airily surreal in the usual Doctor Who style. That's really kind of the way I think, though - set the scene first, then tell the story - so I have no idea how to otherwise start.
The two stories that deviate from this are "The News Agent" and "Legend and Lies", and that's because they are both of a different style entirely. TNA is a character introspection, and LaL is a first-person story told like a village elder telling the children a story around the fire.
This is off-topic, but I am so very pleased how many of these stories are classic DW. Not a single Tenth Doctor listed here at all!
I like this meme because it's a novel way of looking at your writing style and thinking about what works and what doesn't work. It might actually be instructive to go and pull first lines from my first stories, or somewhere in the middle, to see what has changed over the years. Also, all of the works above are short stories, and I think it would be interesting to see how my first lines of chaptered fics differ.