By this I mean, specific types of characters or events that continually pop up in your own work (finally, a topic that caters to people who have multiple stories under their belts~)
I'll get the ball rolling with some of my own:
1. Lost Little Boy
I do this SO much; I think it's the one trope that's so ubiquitous even people besides me can pick up on it.
So this character archetype is a young male-gendered child (age 7-13) who is very cute and sweet and nice, but not necessarily innocent. He often has a dark/painful past that he keeps to himself, and as the story goes on he learns to feel safe with the rest of the (usually older) cast, and/or that he doesn't have to prove he deserves to be valued and loved.
I don't know why I keep doing this, especially only with boys. Maybe it's 'cause I feel like 'lost little girl' is too obvious...? I mean, for a girl to be the small weak cinnamon roll in the cast that just needs a 'found family' feels more predictable, somehow...although I can't come up with many examples of this off the top of my head (The Bad Batch, maybe?)
2. Jaded Little Boy
This is a character archetype similar to #1, only this 'little boy' is usually a little older (age 14-19, sometimes even older) and no longer a cinnamon roll. ^^; He is mean, sarcastic, petty, and stubborn, and 90% of the cast can't stand him...but usually, there is one person in the cast, often an older male role model, who is either patient or kind enough to ignore his antics, and eventually gain enough of his trust to be able to help him heal.
I know why I do this-- because it's fun~. The juxtaposition of vicious, bitter cruelty on a tiny cute/pretty boy is just an endless delight for me. ^^ Notably, most of my Jaded Little Boys have the 'Jun Sakurada' voice (someday I will rewatch the Rozen Maiden English dub and find out the name of this voice actor who's been such a big influence on my life). When I imagine their dialogue in Japanese, they're voiced by Inori Minase.
3. Rebel Little Girl
This one is difficult to see, because it can easily be written off as typical protagonist behavior (most of my protagonists are both girls AND Rebel Little Girls). But when I do male protags, they're rarely like this, so I consider it a specific trope.
Anyway, this is a relatively young female character who is endlessly curious and very willing to break or bend the rules to follow her own way. Usually she has a strict or oppressive home life, but craves adventure and isn't afraid of punishment (even if she probably should be...).
Of the few female protags I have who aren't Rebel Little Girls, about half of them used to be before [insert traumatic/life-changing event]. You might say this is my blueprint for the female protagonist. ^^;
4. Villainous Parents
A lot of my characters have parents that are kind of...'evil-themed', for lack of a better description. They're not always actual villains, but they're usually cold, aloof, have grand ambitions, are generally rude to most people but have a slightly softer spot for their kids.
Sometimes this is because they actually love their kids dearly, and sometimes it's because they see them as valuable pawns. Sometimes they're outright abusive and have no real love for their kids, but feel strangely possessive of them. Sometimes it's a mix of all three.
No idea where this comes from; I can't even really think of any fictional characters I might have been inspired by. But I do love these characters when I do them (they're usually fathers). My favorite one is a mix of the first and second types: he does love his son, but his 'parenting style' is more akin to managing a science experiment, and his motives for being 'nice' to him are questionable. It's sweet and funny, though, and his son's goofball personality makes it work.
5. Tall, Dark, and Female
This one has a bit of a rationale behind it-- I just find it limiting that the 'pinnacle' of an adult female character is always to be sexy and showy and bright and loud, even when they're villain-coded (where 'bright and loud' can be replaced with 'soft and slinky' if necessary).
There doesn't seem to be a lot of room for ladies who are brutish and vulgar, or quiet and closed-off, or maybe even a little grimy and gross (like, legitimately repulsive, not just a little roughed-up for extra sex appeal).
'Quiet and closed-off' is the avenue I choose the most, since I understand it the best. I basically give Batman's personality and aesthetic to a female character, who is usually older and taller than the rest of the cast. She often becomes a mentor to the other characters, showing her kindness through actions instead of words, and trying to teach them to be strong. And this goes without saying, but she's also usually a skilled and ruthless warrior. ^^
I draw very heavily on anime to inspire these ladies; it's much easier to find them there than in Western media (although I'm very open to recommendations if anyone has any).
6. NOT the power of friendship
I want to try to finish this with at least one event-type trope. ^^;
So when it comes time for the big finale, I usually have the MC solve things by themselves. Their partners/friends are around to support them and make sure they get to where they need to go, but at the end of the day, the MC's strength comes not from those relationships but from their own inner selves, and what their journey has taught them about what they're capable of.
To be honest, I think I do this because I wouldn't know how to write a 'power of friendship' ending even if I wanted to. ^^; Methinks my brain just don't work that way...