I think your idea sounds good, von. Maybe they don't remember their old life but as time goes they regain their memories...
Guido is indeed not an all time member of the Gang. He is in two or three episodes, if I recall correctly. But maybe he can go after them after some time (after he got told what happened), gets attacked and just before he gets killed Littlefoot remembers him and they slowly regain their memories. Guido could bring messages from and to the Valley? What do you think?

Alright, I start the character taking now since it already started unofficially
Narrator Ducky123Littlefoot Nahla (Twoclaw)
Cera Pterano (Fastbiter)
Ducky The Anonymous Person (Fastbiter)
Petrie bushwacked (Sharptooth Flyer)
Spike rhombus (Fastbiter)
Ruby Ducky123 (Fastbiter)
Chomper vonboy (Twoclaw)
Male Rainbowface (Mimus) PteranoFemale Rainbowface (Galli) Ducky123Redclaw The Anonymous PersonThud Dosu2DinnerScreetch bushwackedGuido bushwackedGrandpa ZimbaGrandma NahlaTopsy vonboyTria ZimbaMama Swimmer Ducky123Mama Flyer rhombusMr. Thicknose vonboyChomper's Mother Ducky123Chomper's Father bushwackedMr. Thicknose vonboyTricia Nahlaother characters we might need later
I'll be the narrator... and, if nobody has any problems with that, I'd like to be Cera

Though I won't have a problem if somebody else wants her.
You probably know my colour system already? red=character not taken, yellow=character might be taken or more than one person wants to take it, green=charakter's taken