if you're having trouble finding furikake, just get some instant dashi and blend with chopped up nori and/or sesame seeds.
your ahi is basically the default local style (the local bowling alley actually has the best ahi lidat)! we usually slick up with some mayo-based sauce; just basically shoyu or even sriracha and mayo blended together.
by the way that's pink tombo ahi you got there, also good for poke! all different kine ahi-s. atlantic bluefin is actually my favorite, but da kine endangered now. malama 'aina, malama kai! mostly get yellowtail ahi here.