Here are all the details of the various ranks in the Embassy:
0 posts - Newcomer - 0 stars in your rank
10 posts - Olimar
25 posts - Lucas
50 posts - Kirby
75 posts - Diddy Kong - 1 star in you rank
100 posts - Pikachu
125 posts - Peach
150 posts - King Dedede
200 posts - Mario - 2 stars in your rank
250 posts - Zelda
300 posts - Fox
400 posts - Zero Suit Samus
500 posts - Link - 3 stars in your rank
650 posts - Meta Knight
800 posts - Samus
1000 posts - Bowser
1200 posts - Donkey Kong - 4 stars in your rank
1500 posts - Wario
2000 posts - Ike
3000 posts - Master Hand
5000 posts - Tabuu - 5 stars in your rank (congratulations!)
That's basically it, stay tuned for more info!