Wow, Mina Ashido and Izuku Midoriya, huh? I've read a few fics with this pairing, and the emotional conflicts tend to spin around their wildly different personalities. Mina is this vibrant, confident social butterfly, while Izuku is a neurotic, self-doubting overthinker. A lot of writers play with how that contrast creates misunderstanding—Mina might think her straightforward affection is overwhelming him, and Izuku might be convinced he's not 'flashy' or cool enough for her.
There's also this undercurrent of hero course pressure they share. Fics often explore Mina feeling like her Quirk isn't as 'heroic' or powerful as his, leading to insecurities she hides behind her cheerful exterior. Izuku, meanwhile, carries the weight of One For All and his self-sacrificing nature. A common conflict is him trying to protect her by pushing her away, thinking his path is too dangerous. I saw one story where Mina got badly injured during a joint training exercise, and Izuku basically had a guilt spiral about it that almost wrecked the relationship before it started.
Sometimes the conflict isn't even between them, but how their dynamic challenges class 1-A's expectations. Like, Kaminari and Kirishima giving Mina grief for dating the 'class nerd,' which forces her to defend her choices and confront her own image. It's less about grand drama and more about navigating these quiet, personal doubts that feel pretty real for high schoolers.