Swarm(ok, he's probably C/D list but I love this character!)
Tarantula
Knight & Fogg
Styx & Stone
Demogoblin
The Rose(really make this Spidey's 'Fisk' enemy since DD has long since taken Kingpin) whose only as dead as comics let a character be afterall.
Molten Man(is he still reformed, I can't recall, but Sandman was at one point also so...)