Does anyone else use aids to help remember character traits and names? I know I do. I did use a spreadsheet, but now I use something called a Character Bible which I can link to my Google Docs.
I also use a whiteboard to note down things to do – i.e. Revise this character… Add… Etc.
Cards, cards, cards always worked for me…including all appearance, traits,background , pages used and specific dates relevant to character in case they are dead when I want to involve them in a novel again!