Cecania, Fairfax and the Hero are found at the webcomic Sore Thumbs
Sylvan Migdal's comic featuring Rho, Blur and others (including Rho) can be found at Rho!
David Malki ! (yes, the exclamation point or bang is apparently part of his name) writes the comic Wondermark
Kimiko, Dimitri and Alina Tokamak — but not French existential boredom — can be found at Aaron Diaz's webcomic, Dresden Codak!
Insanely great comic characters: Amy, Shelley and The Boy can be found at John Allson's Scary Go Round!
Lil' Sis, Maura, Indie Pete and Clango can be viddied at R. Steven's webcomic: Diesel Sweeties.
Today's comic features imitations of Hannelore, Marten, Faye and Pintsize, from Questionable Content by Jeph Jacques.
For your webcomic viewing pleasure, Dr. McNinja, King Radical and Pedro the Raptor Bandit can be found at Chris Hastings' www.drmcninja.com.
Pete Abrams draws the continuing adventures of Bun-bun, Zöe (I hope), and Torg over at Sluggy Freelance — the webcomic that started it all for me.
From an older comic (the second one I followed daily) Jon, Diablo, Toothgnip and Philip may make cameos (and their spirit lives on) at Scenes from a Multiverse by Jon Rosenberg.