The Human Torch was to be a star I suppose. Certainly when Stan and Jack added him to the Fab 4 he was intended to be the centerpiece as his breakout into his own series in Strange Tales suggested. But weirdly he never caught fire with the fans as much as they'd hoped.
Instead he became a durable member of the team and a crucial part of the Fantastic Four mythos. Visually he was refined to become an iconic Marvel image. (Loved the later way Kirby drew him.)
But he never achieve the fame of his Golden Age counterpart. He never became a star in his own right.