Makirus is an obscure Tahnžarr, only ever being fully realized in the Locust NES Creepypasta. In the Creepypasta, he is described as lookng like Ebirah, except having traits that are more akin to an actual Lobster. Makirus size-wise is effectively the same as Ebirah. He is able to use his Crusher claw to grab small chunks of the earth and throw them violently with deadly accuracy, and he can propel himself forward in a deadly rampage, slamming into opponents. Makirus was eventually slain by Locust F3 some time before 2001, though he put up a pretty incredible fight.
Canonically, Makirus has tormented tourists and crash landers that either foolishly, or unluckily, ended up on the island's shores. One incident from 1989 resulted in the horrific death of Nick Arbold, his friends that accompanied him left traumatized. A photo from the incident is pictured below.
Image courtesy of Deenosor
These lobsters range from 2-4 ft. in length (from the perspective of a Tahnžarr at least), certainly not a thing you'd want to see at night in the murkey Akridian shores. These lobsters are nocturnal creatures, snatching up any unlucky creatures that sleep too close to the shore. A thing like a Tahnžarr, however, requires a team of them. These lobsters have developed a certainly disturbing method to do this: First, some of them will literally begin to decapitate themselves to invoke panic within other beings, then, if any happen to fall over or become weak, they will leap out of the water to strike, ripping the Tahnžarrs apart limb from limb. The lobsters have a very very massive population around the island, and whenever Makirus is near, those that are roughly in the area that he is in will band together and form a large, concentrated area of lobsters. The Akridan Lobsters have also developed Acid-resistant armor to be inmune to the different levels of acidity that Locust will add to the Akridian waters.