I rewatched the first episode of Gundam IBO. I wanted to make sure I get the set up for the characters and factions nailed down to hopefully prevent confusion later on.
Orga (group leader), Mikazuki, Biscuit, and Eugene are soldiers of the Chryse Guard Security (pronounced KREE-say) within the Chryse Autonomous Region on Mars. They are part of the "third group" which seems to be the child-soldier slave type branch that CGS uses as pawns. There are also two younger members that don't do as much fighting,Takaki (blond hair with black stlyized back or something) and Danji, who died, rip. There's also Akihiro, a bigger dude who is less friendly with the other main four.
Kudelia Bernstein is the prime minister's daughter heading to Earth to lobby for the independence of Mars.
The Gjallarhorn are the military "peace keepers". I'm not sure the full hierarchy yet, but a main player seems to be Major Mcgillis (blondie, voiced by Steve Staley) and his lackey Gaelio. Three officers were sent to Mar to destroy the CGS base: Orlis who was probably killed at the end of the episode, the older Crank and younger Ein.
We also see two characters at 'Haba's Store' on Mars, a shopkeeper woman and young girl, unnamed for now.
This post was mostly for myself but maybe the notes are helpful to other first time watchers.