The Wikidata project maintains links between different encyclopedia articles on the same subject, including subjects too obscure for Wikipedia e.g. using the famous example of Pokemon, Pikachu is linked to a bunch of esoteric wikis, with different target focus, demographics and languages:

https://www.mariowiki.com/List_of_fighters_debuting_in_Super...

https://www.tcdb.com/Person.cfm/pid/48602/

https://bulbapedia.bulbagarden.net/wiki/Pikachu_%28Pok%C3%A9...