Unfortunately mine's the sterotype negative. She had a really rough start in life which excuses some of how she is, and her husband is a controlling arse, which explains some more of it. But she's really unpleasant. She's never held down a job properly but believes it's unfair she's not better off; she insisted she was pushed out of her other grandchild's life but when we had DD, we realised all she wants to do with a baby is hold it while it cries and complain that it's crying. She barely bothers with DD now she's a bit older. She was the same with my DP - she moans that we live far away, but when DP lived round the corner, she never once came to visit.
During the first lockdown, she insisted her daughter drive her to the supermarket for the over-70s time slot and accompany her round the shops. She was 59 at the time (she just turned 60). She could see no problem with this. If you said maybe she should let her daughter do the actual shop, alone, so as to reduce risk to her as an older person, she'd say smugly she wasn't at risk, she was under 60. If you pointed out she was going in the time slot for the elderly, she'd say 'no one's stopped me yet' and giggle.
When DD was born, she and DP had a rough time and it was traumatic. DP's mum kept banging on about how lovely it'd be if DD was late and born on Mothering Sunday. In the end DP was in hospital for days while they tried to induce, and DD was born on Mothering Sunday. It was pretty horrible. A year later it's DD's birthday and MIL was back to it saying how great it was that labour took so long as it meant DD was born on Mothering Sunday, and DP was sitting there looking wretched, so I pointed out no, it wasn't great for DP, it was really miserable for her. So MIL burst into sobs and cried, because 'nobody thinks of my point of view'.
That about sums her up. Incredibly manipulative and self-centred.
I was married before, and my ex-MIL was the nicest woman you could wish to meet. I miss her!