It really do be smelling like it.

Ok, as someone who's only watched the 1st series, who the peck are these people? (Except for Bakura)

note: I've seen a bit of GX, but don't understand it enough

The guy with the purple hair is Yuri from Yu-Gi-Oh! Arc-V.
The girl with the green hair is Carly Carmine from Yu-Gi-Oh! 5D's.
The guy with the blue hair and orange eyes is Jesse Anderson when possessed by Yubel (who was first mentioned in Episode 5 of GX as the voices from the memory Jaden told Syrus & Chumley about).

In terms of personality though... Jorei wins it.

To be fair though, Joeri is literally just Nightshroud but more "pain-in-the-neck"-ish (he LITERALLY copies Nightshroud's shtick of sealing the loser's soul into a card, and Nightshroud wasn't even the first to do it: Pegasus and the Doma agents did it too).

Also, need I mention that Yubel almost succeeded in committing mass genocide just to protect Jaden? F**ked up if you ask me, but hey; if you say so Ringo - I ain't complaining.