Dasha- antagonist and protagonist

The protagonist in my story is a fairly young man called M. Annorax who is a marine biologist.He is around 25 years of age although it doesn't really say exactly in the book. He has dark brown hair and is fairly tall. He is also very intelligent this is demonstrated through the fact that when he is offered a place in the crew to find the mysterious monster and he is not afraid

The antagonist in the book is the sea creature although they dont really say a lot about it because of the fact that it is a mysterious creature they do say that it is around 20  meters in length and is something like a giant squid