I think 'orca' or 'killer whale' might be a good choice

Those terms have been used. Kraken was the go to at the time due to the fact these particular whales are also so much larger than most other accounts that are classified as whales.

I used that quote in a discussion with one of them. I told him "With great power comes great responsibility" and said that sometimes I get the impression instead he is thinking "With great power comes great opportunity".