well, the first thing to do is edxplain how Tigger got there. you can't just have a character pop in out of nowhere, you need to explain how she/he gor rhere, and why the character is there. Is s/he on vacation? there by accident? etc.
as for the story. an evil mage named Chong is trying to take over the region.. and eventually the world, he's allied himself with a group of terrorists named dragonstorm, who have access to the most cutting edge weapons in modern technology. Standing in their way is a hastly assembled assortment of characters, consisting of mages (Lord Stripetail, haresh, Setsuna and others) dragons(Spyro cynder, Tarrax etc), scentists (pelvanida group) and a varied group of cartoon characters (Scooby Doo and others). Together, with Stripetail as the de facto leader, they are calling themselves the Seaboard coalition.this war has now raged for nearly a half year, while the coalition, is making gains, chong and Sragonstorm still control vast areas.