Here's a few that I can think of:
Bowie Lam: Mostly in either doctor, lawyer or other professions in the upper echelons of society. Seems to be limited to be a powerful man in society or at least roles where he is character is rather stern/serious. Though he has exceptions being a marketing executive twice - in that blind series and another with Sonjia Kwok as well as being a villian a few times.
Gallen Lo: I always seem to think he is often potrayed as a "older brother" type roles. Seems to be also common in him as some sort of businessman (Golden Faith, At the Threshold of an Era...etc). Played a few villian roles as well, but generally when you remember this guy's acting its usually businessman orientated.
Christine Ng: Usually her character is one of a "bad woman" in most people's eyes - the husband/bf stealer sort....either that or shes a married woman with extramarital affairs. I swear apart from the very old Cold Heart Warm Blood or something series where she is a teacher, I can't think of any decent roles she's had to date.
Feel free to add more.