Mix'n'match contains several lists of important people from reliable sources and allows to match the names to Wikidata entries with one click. Once all names are matched, it's easy to see what's missing on your favourite wiki, real time.
Are you sick of the Top Ten Wikipedias rank? See if you can get better than your neighbour at a subset of topics! For instance, who has more European classics (list by the European Library of Information and Culture)?