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So basically me and my friend didn't wrote the first part of the lightning thief 'till where Percy fell down the arch.
My OC name: Achilles, son of ??? (Unclaimed), 12 years old
My friend's OC: Barney (the dinosaur JK), son of ??? (Unclaimed), 10 years old
Summary on what we didn't write in the first half of lightning thief:
Both Achilles and Barney has been friends according to Barney after he asked Achilles to gamble on a Uno game with him. They hit it off (mostly Barney clinging to Achilles while Achilles trying to get Barney off his shoulders and leave him alone). So yes, the two of them entered camp before Percy and became Percy tour guide. The 3 became friends and it goes through the same time line and... It's the quest
Both Barney and Achilles sneaked out to join Percy on his quest so no one knew about them disappearing yet at least. (Chiron definitely knows). And the story goes the same, they fight Medusa and bla bla bla.
That's the gist of it