I love when the protagonist has trouble showing emotions on their face, but on the inside, they're full of emotion. An example of this is in The Reader and Protagonist Definitely Have to be in True Love. It's so cute!! Also, I know that in the quick transmigration novels, the protagonist has to act as a character, so I imagine this applies to a lot of them. However, I would prefer if they weren't acting but rather that was their true character. If it's really good though, still recommend it! I'm fine with bxb gxb and gxg
"Goblin Slayer" and "Yahari Ore no Seishun Love Come wa Machigatte Iru" light novels come to mind. Good amount of internalizing with limited expression
My Crown Prince Consort is a Firecracker (A straight romance. MC is a kuudere) Making my Naive Master Love only me(A novel on Scribble Hub. Yaoi plot)