I'll be listing all the members of all the clans here, so people thinking about joining a clan can see who is in it before hand, so they can join it if the people are people they like, or pick a different one if the people are people they don't like

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The Goomba Group
Leader: Yoshio

members:
Satoshi (BSX)
Gold Torizo
Calumnw
Edalbrevlis
Jeffhog the Sonic Guru
Suzakuboy

openings: 2
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The Hammer Bros. Battalion
Leader: Xan

members:
Zidane
Greenguy
Redguy

openings: 5
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The Mushroom Mob
Leader: incense master

members:
Chio-ten Kun
System509
E123
Wernid

openings: 4
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The Yoshi Fraternity
Leader: Space Yoshi X

Members:
Nevux C
Moon
Bobomb
Raikugen
Doc-Yoshi
Solarblade
Smash Bro Z

openings: 1
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The Squig Squad
Leader: Caped Lu

Members:
Mandew
Dorko
Papero

openings: 5

hopefully, this will help you in your choice

=)