I recently posted some of my favorite Toots Thielman recordings. Sadly, he passed several years ago. Gregoire Maret is whom I personally consider to be the greatest living Chromatic harmonica player. And more than just that, he’s an absolutely brilliant improviser, period! Check him out shredding here:
Another current, young chromatic (and diatonic) harpist who plays all genres and is a great improvisor is Filip Jers from Sweden. Check out some of his videos!
He also gives private lessons.
Yes he is mind-blowing! Love him.