WonderSwan:Region Information

Unlike other popular handhelds such as the Game Boy, the WonderSwan was only ever released inside of Japan. There are no region locks or limitations because the WonderSwan only has the one region.

Translations
There has been some translations of Japanese language games as well. There seems to be no central location of all available translations, but below are some useful links. Note that these links all contain translation patches only. Please source your own ROM files.

RomHacking.net's English WS Page

Zophar's List of English WS Translations (Incomplete)

The WonderSwan Translators GitHub

English Speaker Friendly
Unfortunately since the WonderSwan was only released in Japan, the entire WonderSwan library is in Japanese. This list is comprised of games that English speakers can pick up and play without previous knowledge of the game or knowledge of the Japanese language, originally compiled on the RetroGamingNetwork subreddit.