"Leon's mum was a Rottweiler and dad an Italian Mastiff (Cane Corso Italiano). Leon is 6.5 years old, a solid 67 kg (150 pounds), he is a lovely, friendly character with many different expressions and likes everyone (a big teddy bear)."
The Rotticorso is not a purebred dog. It is a cross between the Cane Corso Italiano and the Rottweiler. The best way to determine the temperament of a mixed breed is to look up all breeds in the cross and know you can get any combination of any of the characteristics found in either breed. Not all of these designer hybrid dogs being bred are 50% purebred to 50% purebred. It is very common for breeders to breed multi-generation crosses.
Leon, is that a tad of drool we spy on your face? No worries, even your drool is cute!