>>5908510There's not much to speak about regarding the harpoon. It's basically the trident with actual trident removed (since that's the part I used for his handheld one) while the staff part is flipped upside down since the bottom part already resembled a stylized harpoon. I may mod it to make it more distinguishable down the road but I'm okay with it for now.
Personally I've never been a fan of the idea of Black Manta using a traditional trident and it doesn't help that his major appearances rarely have him using one anyway (besides promo materials and artworks).
Beyond his knives, I generally favor his handheld trident and for a spear-like weapon, a harpoon instead. Specifically I prefer them since the former calls back to his advanced tech while the latter is a nice callback to his being a treasure hunter and sea-monger (i.e. think Manta as Ahab and Aquaman as Moby Dick). It doesn't help that the rare times he does use a trident it's when he usually steals Aquaman's trident where it's treated more as a rare occasion.