yes it is. add invisible sprite to your char (pin it), give it bumpmap props and let it work it's magic on your background.
or - pin the x and y of bumpmap on wall to your chars x and y, and increase Z a bit so it is lighted just around your char. (no need for extra sprites this way)
Sea Monsters template - Isometric
Also includes 40 pages PDF of optimizations and "how-to" for your games, and how the "sea monsters" template was built. Follow link for details :) sea-monsters-templates-and-assets_t162705