Sure, the great Jesuit was a brilliant thinker and expositor of the Catholic Faith. And he was a sensitive political thinker, positing that democracy was fundamentally compatible with Catholicism. Not for nothing was the man made a Doctor of the Church. Moreover, he's one of my personal favorites.
Yes, those things are important and should be brought to mind today.
But the most important thing about him is not as well-known. The most important thing to remember is that St. Robert Bellarmine was a ninja:
Thanks to the late, lamented Speculative Catholic for that, and to Fr. Mark Mossa for saving the image.