On warlock/fighter, I like to recommend not likely with Hexblade but alternatively Fiend. The overlap goes absent and temp HP on your kills is particularly great for melee fighters (additionally bigger degree abilities much like the damage resistance are never ever not likely to be practical). I like to recommend https://dungeonsanddragonspaladin78888.thekatyblog.com/19959327/5-simple-statements-about-dnd-multiclassing-explained