If you have a specific colour in mind it might be difficult to achieve it with mass produced markers.
If you wanted to go down that path you could consider mixing your own inks and using waterbrushes. They're basically like empty markers you fill with your own inks.
Edit: Just realised, that might've been what you meant.
https://store.evansartsupplies.ie/product/26883/Icon-Pkt-6-Water-Brush-Pen-Set/
