There is no rule against doubling up on characters here at DuckVerse - in other words, if a canon character you love is already represented, you are still welcome to roleplay (RP) them. That said, a diversity of characters is always a good thing!
Please note that if there are multiple canon characters, all players reserve the right to decide which canon character (if both) they would like to interact with.
A 'head-canon' is defined by urbandictionary as a "particular belief which has not been used in the universe of whatever program or story they follow, but seems to make sense to that particular individual, and as such is adopted as a sort of personal canon."
Head-canons are permitted. In other words, if a player would like to expand on the background of their canon character they are more than allowed. However, please respect that not everyone will agree with your interpretation of the character. As such, other players reserve the right to not interact with your canon character (and you, as a canon, reserve the right to choose who you play with as well).
Creating a fan character who is tied to a canon character is absolutely welcome and requires no permission. HOWEVER, if you want to RP with someone playing the connected canon character, it is considered good manners to ask them first. This is mainly to prevent confusion when the person playing the canon character suddenly has a long lost wife/husband/daughter/sibling/etc pop up out of the blue. Or your fan character contradicts the canon player's current head-canon.
This is a very tricky grey area, because neither player has the right to impose their head-canon on the other. As such, cooperation is expected of all players to keep the roleplay fun and light-hearted. Remember: This is a cartoon universe which defies the laws of physics, and Darkwing Duck in particular was big on anti-continuity, You can always throw in an 'alternate dimension' angle to prevent character conflicts, or create some other deus ex machina to explain away the confusion.
How involved you get with another players' fan characters is completely up to you. If you decide to collaborate and create new characters together (for example, offspring of your fan characters) it is completely to your discretion as to who has ownership rights.
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