I wrote a fictional story for English class and the main character is called Jonas. In my fictional story, I don’t know if I use Jonas’ or Jonas’s?
You can make a case for either. Just pick one and stick to it. I prefer Jonas’, which probably means Jonas’s is the accepted way of writing it by now.
Living languages change. Most publishers now prefer the apostrophe-s possessive regardless of whether the name or word ends in an S or a double-S. So while you won’t look foolish submitting work with Jonas’ [noun], an editor is going to change it to Jonas’s [noun], the boss’s face, Jess’s hands, etc.
FWIW, Jesus the religious figure is still Jesus’. Hispanic people named Jesus still get Jesus’s.
That said I avoid characters with final “s”‘s in their names just because of that.
Both ways are correct. Jonas is no different that John. They can both have an apostrophe s. You can also do s apostrophe.
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