Wow, great first post, it’s always nice when someone joins the community and immediately starts sharing their work!
I would like to mention, however, that if you’re not familiar with using GBA colors, they would greatly improve all of these sprites. Right now, your sprites don’t blend in with the color palettes of any existing GBA characters.
If you could edit your sprites, or submit additional versions with them using GBA colors (In addition to the colors you’ve chosen) that would be excellent! All you have to do is copy the colors from characters on this sheet. FE8 characters are best, as FE6/7 characters tend to use a less saturated palette. Just pick someone like Marisa and use her hair colors for pink, or Joshua for red, or Tana for dark blue… etc.
The reason I suggest this is not only because your characters won’t blend in with the GBA characters as they are now, they actually look kind of sickly with the skin and hair tones you chose, like walking zombies or something. Unless that was your goal? In which case good job.
But in any case, great first post!