- He is a faithful Christian, despite being raised in a secular (though traditional) family. He became a "civilian member" of the Salvation-Army in Visby in 2007, and a uniformed Salvationist on the 10th of October in 2010.
- He took the course in acting for film and theatre (1st year) at Molkoms Folkhögskola in Molkom, Värmland, Sweden. (August 2011)
- Jonas Larsson Grönström lives in Visby, Gotland, Sweden. (August 2005)
- He starred as Prince Christoffer of Denmark (also as additional Gotlandic minor parts) in "Jungfrusägnen" (with Saga Björling, Vilhelm Blomgren and Tony Öst as the main characters), a musical by Idun Josefin Alfredson Vinterros during The Medieval Week in Visby, Gotland, Sweden. Prince Christoffer (1341/1344 - 1363) was the son of Valdemar IV Atterdag (1320 - 1375), King of Denmark. Bengt Sprowede portrayed Valdemar Atterdag in "Jungfrusägnen". (August 2012)
- He is right-handed, but has played characters that are either left-handed or, maybe, ambidextrous, such as Karl von Silberhelm in Zombiestad Gotland (2008) or the nameless doctor in Den inre vändpunkten (2013).
- He starred as the Rabbi of Anatevka in "Spelman på taket" ("Fiddler on the Roof"), a musical by Sofia Ahlin Schwanbom in April of 2016 in Visby, Gotland, Sweden. (April 2016)
- He became an apprentice of "Tempel Riddare Orden" on Gotland on the 19th of October in 2016, with Oskar Snickars as his mentor. Tempel Riddare Orden ("The Order of Knights Templar") is the Scandinavian branch of the American fraternity of the "Templars of Honor and Temperance". (October 19, 2016)
- He became an initiated member of "Tempel Riddare Orden" on Gotland on the 24th of April in 2017. Tempel Riddare Orden ("The Order of Knights Templar") is the Scandinavian branch of the American fraternity of the "Templars of Honor and Temperance".
With Oskar Snickars (later replaced by Christer U. Ö. Magnusson) as his mentor, Jonas Larsson Grönström was the youngest Knight Templar on Gotland until the 5th of October in 2019. (April 24, 2017) - He was meant to star as Herr Zeller in "Sound of Music", a musical by Sofia Ahlin Schwanbom in April of 2018 in Visby, Gotland, Sweden, but was dismissed from the production due to disagreement between him and the director.
His membership in the Gotlandic Musical Company was cancelled as a result. He was replaced by Joel Sjömark as Herr Zeller. (March 2018) - He took the course in fictional writing of the writers' programme (1st year) at Gotlands Folkhögskola in Fårösund, Gotland, Sweden. (August 2021)
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