There's tons of options for characters with capes, almost any IP is going to have someone that fits your search, so I'd try to narrow it down more to what style cosplay you want to do (fantasy, sci-fi, etc) first.
To add to your list though there's tons of capes and cloaks in the Star Wars universe, the most obvious being Darth Vader
but in newer characters there's Captain Phasma
. The Fire Emblem games also have tons of characters with capes of varying sizes, but especially the big bads tend to have huge heavy cloaks like Zephiel
, but honestly there's way too many to list here. If you're looking for something more superheroic honestly just pick one, a lot of superheroes have had capes at some point in their histories so even if their current design doesn't include it if you really like a specific one just research them a little bit and you may be able to find they had a cape design in the past.
So yeah, I know you're accepting all suggestions but there's honestly too many to list, so it'd be helpful if you included some preferences, or at least provide more specifics about the material you want to work with like color, weight, etc.