IMO (only my opinion) these feel a little too "basic" still. I think too much detail was lost shrinking them down to 48 primarily in their silhouette / stylized body proportions. (again just my personal opinion)
Is 64 considered too tall? I know it's a bit tall for RPGMaker default RTP.
I ~feel~ like you could just take your battlers and give them a left / right walk animation and that could be a platformer / sidescroller 2-directional starting point.