My Hero Academia is an awesome tv show. If you want to watch it online (from Season 1-5) for free then here are a few options (we checked these as recently as February 2019):

 

The yellow button is how to start the trial.

Just cancel before the trial is finished and you don’t pay anything, simple. If you’re wanting to watch My Hero Academia (English Dub) for free and in high quality right now, then a free trial with Amazon Video is your best option.