While Kakara reached outward for the Genki-Dama, I feel like Jaffur is going to reach inwards instead.
An attack powered by his everroiling emotions, probably expressed as some sort of melee weapon and/or contained aura to avoid the issues with throwing it (and because it'll likely lose consistency the moment he lets go of it).
So, using his blue-ki tech as a basis, (along with elements of solar flare perhaps?) he'll probably load up his ki with his anger. More than that of course, any shmuck can make an anger based attack. No, I think he'll package some love in with that anger, along with all of his sorrow (which he normally feeds into the anger).
Anyway, he'll feed all of that into the flame, to give himself a grasp that will outshine any offered by the conventional fighter.