Interesting.
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Everyone's back!!! :O Krill, too! Now, I wonder what Krill did after Full Circle. You have indeed gathered a lot of people. How many are original characters and how many are requests? Rover, Sergeant, Krill, Blade, too, right? Suave, Spakybob, Stunt, Rare Spiffy Agent, Argon Dragon Udon, Jonna, Skill, Strange Odd Shadow (and Brocktree). Am I missing anyone? That would be 13 characters in total! :P
You missed my favorite evil servant, the one and only Demonstrait. There was another guy from Full Circle called TheGuy1 who apparently had Mythran powers, but he didn't appear in the sequels (Rover and Blade were the only reader characters to stick around) and probably won't reappear here either. Luke and Mara are technically created by SamMercury and Ibuggabugga but as they appear, I guess they're more my characters than theirs at this point.
Also you are correct Allison is based on Allison the Writer but she seems to have fallen into the dustbin of doom.