Order Member we haven't officially met

[B.G.]

No: HPFGUIDX 136094

My first thought when I heard JKR talk about an Order member we have 
not officially met was - Charlie Weasley.

1st mention:  GOF (page 52, American).  Harry sees him only briefly in 
the Burrow and he wasn't "officially introduced".  Harry only figured 
it was Charlie because he had blisters and calluses on his hand. 
Before anyone could say anything Mr. Weasley "popped" back from the 
Dursley's and started in on the twins about what they had done to 
Dudley.  Charlie didn't go with the family to the World Cup via port 
key - he, Bill and Percy went by themselves.

2nd mention:  GOF (page 327, American) Harry recognized Charlie in the 
Dark Forest when he was wrangling the dragons before the 1st Task.  He 
didn't talk to Charlie because he was hiding; Charlie never knew Harry 
was there.

So "officially" we have not been introduced but we do know from OOTP 
that Charlie is an order member who is trying to recruit members from 
other countries.

12 uses for Dragon blood anyone?  Recruits from other European 
countries?  Lots to offer in Book 7.

My two cents worth anyway, BG