I recently just completely re-did my character page, so yeah... <a href="
http://nakedelf.comicgenesis.com/charac ... l">here</a> is the new page for reference.
I think a lot of it depends, obviously, on the nature of your comic--do you have a small core cast with a lot of characters who are only seen occasionally? Does the comic follow a lot of characters? Are readers likely to confuse anyone?
My old character page had a pretty simple setup: an icon for each character, with their name and a short description next to them. At the time, I only had two main characters, a bunch of characters who might show up up again... and a few characters who would *eventually* show up in the plot. So there was really no reason to include a lot of information--it just didn't make sense, given that the main characters were introduced pretty well in the comic, and all of the other characters were pretty basic.
Since then, my core cast has doubled, there are a few supporting characters who show up from time to time, the main characters have families, etc. So I restructured my character page to reflect this. I now have four sections, which link to separate pages: Main Cast, Minor Characters, Family, and Cameos (for when characters from other comics or real life show up.)
1. What do you include on your character info pages?
I basically try to sum up the character as they relate to the comic. If someone is just a minor character, then their description is short--after all, you don't need to know that the guy sitting next to the main character in comic three has a wife and three kids and a dog named Sam. However, the fact that the main character is adopted and loves dogs but has an irrational fear of fur is the sort of thing which could be important, and thus included.
In general, try to keep it interesting.
2. How much info is too much?
Or too little? Basically, the length of the description should match the importance of the character. A minor character can have a few sentences; a major character should have at least a paragraph.
Of course, don't be afraid to change/expand the descriptions over time. After all, as a comic goes on, characters often change and develop.
3. Does each character have a separate page?
No. Each of the four main characters has their own page. The minor characters all share a page, the family characters all share a page, and the cameos are all on a page together. Personally, I think this keeps things neater and better organized, and all of that clicking back and forth gets old when you're only reading a couple of lines.
4. What do you like to see on others' character pages?
Basically, things which are important to the character. If a character got married and then divorced and had a baby out of wedlock which they're now raising as a single parent, and the character page only lists their preferences in cheese, I'm going to be confused. The character page is especially helpful when it comes to characters who're important but not always in the comic, or who have long pasts which might be hard to keep track of (wait, what did Joe do for a living three years ago?) but which contain relevant plot points.