There's been 4 killers in the TV series with Piper, Keiran, Beth, and Jamal, wanted to hear opinions on who people liked, hated, and with a lot of talk about motives lately, thoughts on the motives in the series.

For me personally the only killer for me that was memorable was Keiran. I don't think the other killers were that bad. But the way he did Eli dirty, him only going to jail at the end of his reveal (not the series I know) and overall I love how close he was to Emma throughout the series made his reveal a lot more impactful imo.

I can't say much for Piper as I didn't care for her much as a character.

And my memory is fuzzy with season 3. Though I remember enjoying Beth's reveal as well as Jamals very subtle killer reveal.