some people really don't care about non-canon foreshadowing characters... but that's not the main reason for me to investigate them...
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D: A question for Oda-sensei. Whenever I’m searching for Pandaman, I wonder about something. Who is this guy who’s always seen nearby? And what’s that thing he’s holding in his hand?
O: What? Who is he? TOMATO GANG, OBVIOUSLY. Yep, that’s Tomato Gang. There’s no one else it could possibly be. He’s a debt collector. He’s on the lookout for Pandaman, trying to collect the money Pandaman owes. He carries a “thing that looks like a gun”. Word on the street says it’s actually a konbu seaweed roll.
Pandaman is so far the most notable of Oda’s joke characters, having appeared hidden in nearly every One Piece chapter, episode arc, movie, and such.
Unforgivable Mask is a hidden One Piece character, much like Pandaman. He is in fact, Pandaman’s rival.
and now the finale. Who is the rest ?????? well that's beyond my knowledge