Frankly I'd have to do an ISO to remember (I've got a memory of a cockroach). Here's what I usually do though:
I put down the list of players with a blank (white) background. Everytime someone says/does something "town" I upgrade them a shade (green, then light blue, then blue, then dark blue). Everytime someone says/does something scummy I downgrade them a shade (yellow, orange, light pink then dark pink). If it's a minor thing I use +/- instead of changing the bg colour though, but if I get +++ it warrants an upgrade.
The thing is I only write down major stuff that could/would be used to make a case. Minor stuff and/or mostly town stuff I don't write down bc I don't need to make a case against someone I'm town reading.
It's a bit confusing; I know.. but it works fine with me. Right now my top 3 scum reads are shotty, N_M & Kop, but I don't feel p○7rticul○7rly strong on either of them. My top town read is Mario followed by kelbris. Everone else is null/undecided.