In order to find the marker that works for you, you’ll need to experiment. These Charpak AD markers aren’t mainstream. If I look them up on Pinterest, not much shows up. They’ve been around for ages, and I’ve noticed that when I go to the art store, they tend to be hiding in a corner behind the giant case of Copics.
They’re worth a try. The result is a bright, solid, consistent ink that mimics watercolor. They are blend-able, and the chisel tip is really easy to use (there’s also a fine-tip option). One marker last a really long time and they are comfortable to hold. These are permanent, and they are also waterproof. They come in around 130 colors. The price is good too in my opinion — about $3 per marker.
However, I tend to avoid these markers most of the time because of the smell. If you use them too long, you are guaranteed to feel lightheaded or get a headache. The smell also takes a long time to clear out, so I only color with these outside. They are not refillable, and they bleed. They bleed onto the other side of the paper in addition to bleeding outwards from where you drew. If you are using thin paper, then you need to put scratch paper underneath or else they will bleed onto whatever surface you are drawing on. Bristol paper or Rendr paper are the most compatible in my experience.
If you are at the art store, test them first. Smell them. See what you think. They are good quality markers, but I don’t think they’re for everyone.