Snakeheads/ Channa are a nice fish - Big as well depending on which one you choose to get .
Jaguar Cichlids are nice great colours on them too when a large size they also have great personalities - well my 8inch female does , aswims up to the front going back and foward like its playiong tick or something .
Oscars are known to have great personalities great fish too if you get a bigger enough tank to house about 5 of them .
P'Bass a large group of them in a very big tank are great to watch .
Black Belt Cichlids my 9inch Female is great , no aggro' between any of her tank mates great bright blues and reds and a very dark black band .
Jardini Arowana great fish to be kept on thier own , can be very aggressive toward other fish so best kept on thier own in a verty large tank .
Silver Arowana nice large fish bright silver colour needs a large tank as they grow very big , unlike the Jardini the Silver's can be kept with other fish , but only large fish that cannt fit in thier mouths and the Silver Arowana would think as food .
Tiger Shovel nose Catfish a nice large bottom dweller nice pattens , need a large tank/ pond as thier go large too .
Tig' Catfish amazing pattens , grow to a large size too .
Sting Ray - great large bottem dweller , great pattens , great to look at .
Etc . . . . .
I could go on for awhile naming aload of diffrent large fish for you to have a look at , but i will stop there for now .