Well, KR Bulgaria (at least the last time I played, might have changed in the meanwhile) suffered from a large lack of events. If they lose the Balkan League war, then they just get occupied and then sit around. If they win it, they just sit around without getting occupied. I for one would like to see an event chain regarding Revanchism and Fascism in a defeated Bulgaria, and if they win - why not on to Constantinople! It's the holy city of Orthodoxy, and leading an Orthodox Crusade to recover it would greatly enhance Bulgarias prestige and hold over the defeated Balkan league countries. Partition the Ottomans - East Thrace and Tsargrad go to yourself, Crete, Cyprus and the Aegean Islands to Greece, and Eastern Anatolia to a restored Armenia, which will serve as an ally.
At least, that's how I would like to see it...