And Seishi killed herself to save the world ages ago in Eastling's Devil and the Deep Blue Sea plot, which was also pretty awesome.

I can't remember any other instances, but as has been proven, my memory is terrible.

I'm still a little tempted to say Minako died during CNC's endgame, but it seems like it'd be a bit gratuitous.

the day the teen trauma trio was born

Yes.

Good times.