[quote=@Billsomething]
[@Weird Tales] Just a bit curious but do you have any stories or perhaps tips to share on how to spot an SJW character
[/quote]

Well one time when I was part of a superhero roleplay we got into a discussion about a DC animated film featuring Harley Quinn and one of the players got rather defensive about how the character having sex was overly sexualizing her and brought up some other bullshit reasons for why the other female character was in the move and he explained it a way that didn't even make it seem like he fully watched the movie. 

Another example is when I got into a political discussion on another rp and one guy got upset and said he wouldn't rp with another player because he thought he was a Nazi even though he really wasn't. Also people who get upset over dark characters tend to be SJWs sometimes.

In my opinion I find that looking over their character sheet and watching out for political discussions will give you a good chance at seeing who is probably one and who is not. Like if I see a character who is extremely self righteous and rebellious in a leftist sense then that gives me hints that they might be a SJW. Also the Off-topic forum has threads that will attract them

Hope that helps