Please. Just stop. Stop creating profiles for them, stop adding them to summary pages. It's junk information. There are more important things missing on this wiki. I appreciate your dedication, but just stop. Adding locations is great. That's something that is sorely lacking.
Suggestion: There are (See Category:Character_History_Needed) over 15000 characters pages that have no summaries. These are a lot of bit characters who appear only once and are never seen again, but the difference between them and say a guy on the streets of New York named Joe is that they are unique. If you want to focus your energy on bit characters, perhaps focus on those pages have been without summaries for years.
Can you provide some references as to how you are connecting characters (such as NYPD officers and crooks)? Just because two police officers are named Joe, doesn't mean they are the same guy unless there is some coroborating information.
It depends according to the story of that particular minor character: the connection may be for location-based, related to a certain team or organization, to a specific boss or employer, etc...
So if there's at least one recurring common element between namesakes and clearly no opposite or conflicting reason, I may assume it's the same character.
No, you can't.
There is nothing to support that other than presumption.
Logically speaking, using the NYPD as an example, you have been tagging officers named Joe as though they are the same guy. However, New York City has over 8 million people, of them there are over 40 thousand police officers. Joe is such a common name it seems highly unlikely that one generic police officer is on all of the scenes you have attributed to him. Likewise, if you look at how these characters are drawn, they either look different or are drawn so generically they are indistinguishable with any other background person.
The going rule is this: Unless a character of this nature makes reference to a past encounter or event that they witnessed then they aren't the same character. Example: The cab driver in Fantastic Four #1 has appeared in Fantastic Four #160 and Template:Tales of the Marvel Universe. The reason why that connection is made is because that cab driver mentions at least one of those past encounters. Conversely, every NYPD officer named Joe that you have tied together don't make such references.
Frankly, these are all one-off characters. If it were up to me, I wouldn't allow people to create pages for these characters. It's junk information that doesn't really belong anywhere but comic summaries. Nobody is going to go looking around for "Joe the police officer" on this Wiki. There are other, more important information missing on this Wiki that we should be focused on instead of such trivial information. However, others seem to think that we need to add pages for everything. So if you really insist on creating these junk pages, can you at least do some proper research.
So, according to your example, if I come across another NYPD officer named Joe with no apparent reference to past events, should it be left untagged in the comic summary or could it be still tagged under the Joe (NYPD) (Earth-616) entry with a description like "Another police officer named Joe..." or any other 'disclaimer' formula that would distinguish possibly different characters?!
I've come across five or six of the locations you have created where you cite its first appearance as whatever comic you happen to be reading, instead of doing any sort of research first. Namely a lot of locations in New York City.
Please do the proper research before you plug in an issue that is a first appearance, especially if it's a location in New York City, as Marvel has been publishing comics since 1939, there is a chance that whatever comic you're reading is NOT the first appearance of a given location in NYC.
If you cannot confirm if you have the first appearance of a location in your hands (which I'm betting if it's a comic published in the last 20 years and it's a common location it's not) please refrain from listing a first appearance.