So I’m getting started on making games through rpg maker, and am wondering how people manage to pull of the visuals for fatter sprites for characters through portraits, overworld sprites, and other images
People reuse material from other games in this and/or draw new assest.
If you want to do the former you should enter the discord of Gumia Unbelted Terror (previously named Unnamed), which can be access through this link:
If you want to do the later you can either search in internet for a tutorial on sprite art or hire an artist specialized in this.