One thing I miss on @wikidata is a search (ideally part of the actual search function, or maybe some tool with an API) that can specifically look for human names with initials.
Example: Do we have an item on, specifically, "G.L.D. Leite"? Not other things or people named "Leite", a human with these initials, in labels or aliases, any language?
Maybe some SPARQL regexp horror that times out regularly would technically be the answer, but is there something quick and reliable?