Ah sorry about that, I just kindof jump in there and start offering advice.
In your particular case, you have 3 comics which comprise a single website's 3 day a week update schedule. The site is called The Dugs but there is no comic called The Dugs. The reader is presented with one of 3 comics, each with their own title. That may confuse some. Since the main page is a central point, then let it serve its perpose. Make it a hub, make the main focus be the main banner with the Dugs logo, possibly featuring prominent characters from each comic, and just as you have it now, explain that this is a collection or grouping of baseball webcomics. By adding at least 1 character from each comic on the main banner, you will let people know what to expect and what to look for.
Under the banner, I would have 3 links, each about the size of a leader board ad, featuring the title and characters from their respective comics and the update day such as (Tsunami: updated Mondays) then a seperate one for (Ghosts: Updated Wed) and another for (Portland: Updated Fri).
As far as where the links take you, I'd say create totally separate pages with their own look. Seeing the same background etc. over and over for different comics may seem tiresome. That being said, make sure to have the central theme stay the same, such as the Dugs logo, baseball theme etc. But the backgrounds could change whether that be images, color, something to let them know "hey, you're really looking at a separate comic here."
As long as you have the main "hub" page clearly establishing "Hey, this is a site with multiple comics and below is where you click to read them", then you're off to a good start. You may want to offer a preview button to show readers an example of each comic as well.
Sorry for the rambling and vocabulary failures, I haven't slept yet and its 6:12 am. Stupid Star Trek Online being awesome and keeping me up.
Hope all goes great, wish you success!