If this fanclub is for all generations then why is the banner G3?

I think G3 was the current generation back when this club was originally made, so that's probably why the アイコン and banner feature G3. I do agree with あなた though that it'd be cool to see all the generations represented on the banner at least.

That said, getting it updated is easier 発言しました than done. There are plenty of people here who are capable of making new graphics, but only the creator of this club has the ability to change it. Either them, または one of the ファンポップ staff members (I'm trying to get hold of one of them at the moment to change a logo in another club that the community voted for).