I found the idea someone made on tumblr about the Voting Gauntlet and I full agree with it. The Big Brother Gauntlet, put together all the big brothers to find out who's the best Onii-chan.

I already got the possible candidates

Leo
Takumi
Ephraim
Ike
Xander
Ryouma
Chrom
Alfonse

I forgot who else....

Name me more onii-chans