Virtual Novel!! I am sorry that I am new to this and dont know some of your terms ... but are you familiar with Doki Doki Literature Club? ddlc.moe/ ... I would imagine the character art to be the same style as this. I dont think it needs to be THAT high end right now, I am just looking to get the characters established so I can start doing some preliminary marketing.
Do you need colors? If yes, you can go flat colors or cell shading. If not, if you just want a basic idea, you can go sketch or lineart. You've said 3 characters profiles (I'm imagining a profile portrait), right? So I will give the price (in US$) for a single one and for the 3 of them combined, ok?