How to make specific textboxes for characters.

[Honeydrop]

Hi, I'm really new to the world of VNM and making VNs in general. I just got VNM while it was on sale, and I've also tried another builder but I'm having a heck of a time doing something specific and maybe kind of advanced?

I have 4 main girls. Each girl has a specific colour. I want each girl's message box to be in that girl's colour. I also want each message box to have an icon of that specific girl.

I'm 95% sure this is possible in VNM but I have no idea how to do it.

 

[Honeydrop]

Small update!
Through a lot of Googleing I discovered the tutorial about Pre-defined objects. So I have the icon thing solved, but I'm still at a loss how to change the message box colour.