Ok, how about this for an idea. We take it in turns to post a favourite (British spelling) comic cover every day. This went really well on the comic fan website that I used to frequent. What we tried to do was find a theme or subject and follow that, until we all got bored with that theme. I'd like to propose a theme of letters of the alphabet. So, for the remainder of October (only 5 days) and all of November, we post comic cover pictures associated with the letter "A". Then in December, we post covers pertaining to the letter "B". The association to the letter can be as tenuous as you want it to be. For example I could post a cover from "Adventure Comics" or "Amazing Spider Man". However Spider Man covers can also be posted when we're on the letter "S". Adventure Comic covers could also be posted when we're on the letter "L" if they depict the Legion of Super Heroes. So, no real hard, fast rules - in fact the cleverer the interpretation of the letter, the better, as far as I'm concerned.
And it's not written in stone that we have to post a cover every day. There may be some days when no cover gets posted. There's nothing wrong with this, it just demonstrates that we all have lives to lead.
If everyone's in agreement I'd like to kick this off with one of my favourite Action Comic covers, from January 1967. Curt Swan really excelled himself here.
Not-long running, and status as a hero or villain is very much a partisan matter here, however:
As I think about it, Beagle Boys may be the second longest running title featuring a bad guy(s). First may be Tomb of Dracula, and I’m not going to count Charlton’s Billy the Kid since that version wasn’t a villain. Who have I missed?
The 2019 Beano Annual ("Celebrate 80 years of the world's longest-running weekly comic") has a front and a back cover that shows a poster overprinted with the word "Wanted", so it must be a valid entry for this month, mustn't it?
Regarding the back cover, I wonder how many of the supposed target audience for the Beano comic (kids aged about 8) will have the remotest idea what is being parodied by the poster of Minnie the Minx.