I wouldn't say Wigan are a second team- just a team I have a soft-spot for... don't really follow them all that much; when they play and I'm watching I do hope they win though.
Same with Chester FC. Being a Cheshire lad, and, I always loved the city of Chester, I occasionally look for news on how Chester is doing.
I quite like Blackburn too for that matter- for no reason I can really ascertain. Again, don't follow them all that closely... I remember liking the red and black quartered away shirts one season... that's about the best explanation I can come up with.
When a North Western team plays against another team, unless they have "Manchester" in their name, or are Everton, I tend to support the NW teams.