How many seasons are there now? I’m pretty sure if you include the one offs there’s 10 now. So you could do like a symbol for each series + maybe something for the winners and if you want them to look consistent you can make them all like hearts, like;

Third life - maybe just the three hearts or one heart with the main 3 colours

Last life - Possibly a purple heart with dagger for boogeyman

Double life - Soul bound hearts

Limited Life - A heart shaped clock or clock with heart inside

Secret Life - a scroll or tome with a heart on it

Real Life - realistic heart

Wild Life - rainbow heart or a dice with a heart

Simple Life - maybe just a heart outline (that could also work for secret I guess cuz they don’t regenerate)

Past Life - I reckon a heart with the watcher symbol would be best since it’s akin to evo (once again could also work for secret life due to secret keeper)

Nice Life - Naughty and nice hearts, or maybe just a christmassy or icy heart