Larxene: Blonde haired female; wields lightning magic and claws. Doesn't really look like Namine (and I have no clue where you got that comparison. Their hair colors aren't the same and their faces are nothing alike).
Vexen: Blonde haired male; obsessed with scientific research and experimentation.
Marluxia: Brown hair; wields a scythe, not a staff.
Axel: Red haired male; wields a customized form of chakram: A circular weapon spiked along the edges bisected by a cross to allow easier wielding by hands (generally, chakrams are used either for throwing or as armguards. While he does use them for throwing that is clearly not their primary use, so they are not shurikens).
Lexaeus: Looks like Zell... Sure, except for the different facial structure and much darker hair (seriously, these comparisons need to stop); wields dark magic and (I think) a hammer.
Zexion: Similar to Sephiroth in that he has a lock of hair coming down along his face. That's the only thing lending any credence to that comparison. Dark grey hair that is much shorter than Sephy's, one lock of which (versus Sephy's two) crosses over onto his face; specializes in manipulation; tries to wield light, but cannot do so effectively because he is still primarily a user of darkness.