Fairy Tail: Multiversal Travel
Ryoma mysteriously transmigrates to the world of Fairy Tail. But unfortunately, he remains a non-mage for seven years, becoming an ordinary person in the guild.
But one day, the dormant dimensional power in his body throws him into the Demon Slayer world. There, his Ice Breathing merges with his magic power, and finally, he gets an effective magic, Ice Magic.
And this was just the beginning. The dimensional power within him erupted from time to time, throwing him into various different worlds again and again.
Ice Magic from Demon Slayer's breathing style, Space-Time magic from Black Clover's Grimoire, Conqueror's Haki, Imperial tools, Zanpakuto...
Each time he returns, only a moment passes in the Fairy Tail world, but he rises with new powers.
With these newfound powers, Ryoma will eventually write the legend of the Dimensional Mage.