The rule covering capitalization is "Exception: If the credit information is entirely capitalized, use standard capitalization rules instead."  This rule does not have anything to do with accented characters.

The rules continue: "Use the "Credited As" field where the person's name differs from the credited name."  If an actors name can be documented to include accented characters, the Credited As field should be used.

The rules continue: "To determine whether to enter the name directly as credited, or to use the "Credited As" field, use the Credit Lookup tool."  Note that the credit lookup tool is only a tool.  It is not intended to override properly documented actor names.

Some credit listings have fully capitalized names with accents, some without.  Some have mixed case with accents, some without.  So, it's not possible to determine whether the accents were left off due to typeface limitations or due to intent.  We try to keep rules simple even (sometimes) at the cost of infinite "accuracy".  The Credited As field allows actor linking across your collection while maintaining the credit list as shown.

Hope this helps.

The credit lookup tool is intended to cover where there is inherent ambiguity.  If, for instance, marriage causes a name change, there's no need to immediately go back and edit all the other profiles, especially given the average success rate for Hollywood marriages.   It is the tiebreaker, if you will, where the actor's name is in dispute.

Accents/lack of accents in the credit, where they can be shown to be part of the actor's full name, should not fall into this category.

"ß" is a relatively rare case in that there is no capital version.  With instances such as this (if others are found), when there is no upper case equivalent to "ß", and if "ß" is routinely capped as "SS" in the native language, the "ß" character may be used.