Monster arrangement
2. Not having to go through all the menus to go back to what we were originally looking at. If I close my monster in synthesis after looking at it's stats to make sure it's the right one, I don't want to be sent ALL THE WAY BACK to the first page where I have to select what monster to synth first.
3. Some icon that tells me the monster is carrying something. Or even better. A smaller icon version of what the monster IS holding in the corner. My monsters are my extra pockets. It's a pain to go through them all.

Respect yourself enough to walk away from anyone or anything that no longer serves you, grows you or makes you happy.