Mpimbwe are the ones with the "puppy dog" reputation. Really it depends on the group, individuals, tank setup, etc. But, yes, in earlier years it was mpimbwe among those wild giberrosa imports that were known for being less shy. Smaller juvies of most giberrosa are actually pretty similar if they're comfortable in the tank, as they get older it just depends. Zaire/Congo coast giberrosa (moba, kapampa, mikula, etc.) do tend to be more shy on average, mine are out all the time, but individuals I've kept over the years vary some. How you set up the tank can make a difference, growing out juvies in a more open tank encourages them to be less shy than a lot of snug little caves.
More of a flowerhorn word. While some of the big cyphotilapia forums are gone now, if you showed up on one of them using it, the experienced members would think you're a newbie. ?
There are two Cyphotilapia species, frontosa and giberrosa. Frontosa do tend to have larger humps on average; especially some older 6 bar frontosa can get an exaggerated hump. But some giberrosa individuals can get a respectable hump also. (mpimbwe are giberrosa)