Sure! Gladstone is canonically claimed to be the ‘champion ukulele player of Duckburg’ in one of Carl Barks’ comics, Good Canoes and Bad Canoes-

as for the continuity of my comics, I guess I try to write them so they can either be stand alone or linked to one another- the canon comics sort of have the rule that everything gets set back to a certain default. Even if the ducks have gradually evolved and had character development, there are never any huge shifts; Donald never marries Daisy, Gyro never dies from blowing himself up, and none of them age! Imagine how weird it would be if they did? So yeah, I go from the same perspective- namely, Gladstone and Magica will always be the characters they are recognized to be at the beginning (and in some way the end) of the doodle comics I write; whether or not the previous doodle comics ‘have happened’ to them is up to you as the reader!