Although some existing tropes like Magnificent Bastard may fit here as well.
* The Bet (a weird version of Meet Cute)
* Long Lost Love ("Billy? Is that you?")
* "New Old Flame" connected to a "Meet Cute"
* Handsome/Lovely Adversary ("She's gorgeous, I hate her")
* Alpha Bitch
* Handsome Devil
* Millionaire Playboy
* Reformed Rakes
* Temporary Love Interest
* The Billet-Doux
* Love Letter Lunacy
* The Angry Outburst
* The Masochism Tango which leads to an Aw, Look -- They Really Do Love Each Other.
* Pressure From Above
* Arranged Marriage ("You will marry Princess Lucky, so you better get used to the idea!")
* Parent Ex Machina
* Parental Marriage Veto
* Star-Crossed Lovers ("Never was a tale of such woe...")
Although some existing tropes like Magnificent Bastard may fit here as well.
* The Bet (a weird version of Meet Cute)
* Long Lost Love ("Billy? Is that you?")
* "New Old Flame" connected to a "Meet Cute"
* Handsome/Lovely Adversary ("She's gorgeous, I hate her")
* Alpha Bitch
* Handsome Devil
* Millionaire Playboy
* Reformed Rakes
* Temporary Love Interest
* The Billet-Doux
* Love Letter Lunacy
* The Angry Outburst
* The Masochism Tango which leads to an Aw, Look -- They Really Do Love Each Other.
* Pressure From Above
* Arranged Marriage ("You will marry Princess Lucky, so you better get used to the idea!")
* Parent Ex Machina
* Parental Marriage Veto
* Star-Crossed Lovers ("Never was a tale of such woe...")
* Love Hurts
* Ungentlemanly/Unladylike Behavior
* Love At First Punch
* Mistaken for Cheating
* Case of Nerves
* Love Makes You Dumb
* The Big Decision
* Disaster!
* The Chase (oddly enough, a version of The Chase)
* On a Pedestal
* Mary Sue
* Beautiful All Along
* Dont Let Him/Her Get Away!
* Race For Your Love
* Disapproving Authority Figure
* Parent Ex Machina
* Two of a Kind
* Like Brother and Sister
* Sub Rosa
* The One
* Furious Attraction
* Slap Slap Kiss
* The Unknown Child
* Neutral Party with Words of Wisdom (a type of Messenger)
* The Old One Who Knows But Aint Sayin (another Messenger, possibly a Secret Keeper)
* Girl/Boy Next Door
* She Is All Grown Up
* Mistakenly Overheard Conversation
* Three Is Company, romance novel style
* Mistaken for Cheating
* Sweet Nothings (Pillow Talk)
* Right Under Your Nose (Stop chasing the Duke; the stableboy has a nobler soul)
* Mysterious Past (Why did he leave London?)
* A Backstory version of Forbidden Fruit
* Forget It and Run!
* Opposites Attract
* The Perfect Gift (a romantic Golden Snitch?)
* The Imperfect Gift
* Redundant Romance Attempt
* The Ugly Duckling
* Beautiful All Along
* Hollywood Homely
* Hot Librarian
* The "Near Mrs."
* New Old Flame demonstrating A Man Is Not a Virgin (May I introduce you to my... good friend?)
* Like Brother and Sister
* Love Triangle
* Betty and Veronica
* Muggle and Magical Love Triangle
* Rich Suitor, Poor Suitor
* His/Her "True Nature"
* Self-Conscious About Best Feature
* Beautiful All Along
* Hollywood Homely
* One Who Intercedes (a Secret Keeper who is more active, like the Nurse in Romeo and Juliet)
* Mindlink Mates
* December-December Romance (or alternatively Grow Old With Me)
* My Secret Pregnancy (category romances signal this trope with the phrase "secret baby" in the title)
* No Loves Intersect See also Romance Arc.