Nessie is a 15 foot tall shark that was made as a weapon to fight in WW2. After WW2 he fought in Vietnam and Iraq. He is the guardian of a 4’3 orca cub named Lucas and protects Lucas’ sister too. He may seem intimidating, but he just wants to either help or ask for something. Maybe ask if he can cook for you ;3 
He doesn’t show much emotion besides a frown, slight grin, a growl or two.. maybe even a chuckle at something funny. But he won’t hate you unless you attack his family.