From what i can remember from when i was a kid and forced to spend a lot of time in restaurants and cafés.
3 if the service is good and they are on a good mood, but probably follow something like the "10% rule" or something that make the actual amount dependant on just how much they spent, which could spand from sizable to barely anything, probably the "best" one due reliability along with...
5, leaves a tip but may be too pressed with money to afford giving a huge one, the actual boon is that old people tend to move in packs and tend to all go for the same simple things, making the easy to get a good profit margin from
2, will be unaware tipping is a thing at all unless it is pointed out for them or they see some other customer do it, but then they get flustered and are otherwise undemanding.
1 looks like the High-Risk, Low-Reward sort that does not only not leave a tip, but will be very demanding and they will threaten to sue for [x] reason unless you give them free food if you give even a slight opening.
6 won't leave a tip for obvious reasons.
4 will leave a good tip if they get empathic with the plight of their waiter for needing them or the place is "local and cozy", but won't or only elave a token one if it is "upscale".
All generalizing stereotypes here though, some 2s give good tips immediately, some 5 don't give any at all and even sometimes 6 end up giving really good ones, or rather Daddy gives a good one out of shame/bribery when he comes to pick up his babby boy/girl.
Also gotta keep in mind that the waiter/waitress also plays a role, even with the same approaches and reactions there is disparity in how much people give due looks and such, because people are shallow, course most of the places i knew of had that kinda pointless at the end of the day since they did the "Pool and split" method, did deliberately have repeat customers get their "favourite" each time it was possible to maximize tip gain though, probably for the best too.