Book ideas for adult who likes Harry Potter...

[TakingControl2023]

And also Twilight. Adult in their twenties who I know has enjoyed those books previously :)

Anyone know of anything similar they might enjoy?

These are excellent. Dark, funny, romantic.
A Deadly Education
The Last Graduate
The Golden Enclaves

Jonathan Strange and Mr Norrell by Susanna Clarke,
The Magicians trilogy by Lev Grossman,
A Sudden Wild Magic, Hexwood, Deep Secret, The Merlin Conspiracy, The Dark Lord of Derkholm, The Year of the Griffin by Diana Wynne Jones.
The Bartimaeus series by Jonathan Stroud,
The Sabriel series by Garth Nix.

Seconding Guy Gavriel Kay (start with the Fionavar Tapestry..?) and the Abhorsen books by Garth Nix.

Everworld series
most of Holly Black's work
Piranesi by Susanna Clarke

The magicians guild by Trudi Canavan is a particularly great series of books too!