The groups are basically
the two/three major groups in Greed Island who fight each
other to finish the game.
Tzesugera
He is Mr. Battera's
employee and we do not know much for the moment...
Nikkes and others...
He is the leader of
the group who has been killed by Boomer. They wanted to take
possesion of most of the defending cards and then attack Tzesugera's
group with offensive spells. Without the defense cards the
group with be defenseless so it would be easy to steal their
cards.
Genthru
This is Boomer and
his acolytes clan. They form a group and kill people to steal
their cards and to increase the card amount.
Phantom Brigade
The are the killers
of the story but are not really a group, they want to find
the Nen eraser so that he could erase their boss's evil Nen.
Gon/Killua/Biske
We all know them, they
want to have fun, that's all
UNKNOWN
It seems this group
appears in the 16th manga so we do not know yet what is going
to happen.
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