Karen: I know I have mentioned this, but I'm reading the Sub-Mariner Masterworks, and our friend Triton of the Inhumans guest stars in five different issues! Sure, there aren't a lot of water-breathing super-folk out there to choose from, but he worked well with Subby. I recall him also hanging out with the Fantastic Four quite a bit in the mid to late 60s (not as much as Crystal, but often enough), and of course he popped up now and again in other books, like the Avengers during the Kree-Skrull War. Of all the Inhumans, other than Blackbolt, Triton was my favorite; it might have been his noble demeanor, his faithfulness, or maybe just that great Jack Kirby design. In any case, he made a great guest star.
Karen: Another guy who fits this category: Hercules. The lion of Olympus had a couple of great runs as a guest star in Thor -the first time early in the Lee/Kirby era, when he and the thunder god battled Pluto; and then again, in the 70s, when Gerry Conway brought him back to join Thor and his companions. Hercules' jovial, carefree attitude played well off of Thor's more dour nature. And like all good wingmen, he was adept at both getting him into and out of trouble!
Karen: Who are some of your favorite guest star characters?