Although the ninjutsu ability has the creature enter the battlefield attacking, it was never declared as an attacking creature (for the purposes of abilities that trigger whenever a creature attacks, for example)
And, when you play him, if you have a song that costs that much ink or less, you can play it right then and there for free
It has some generic uses, buffing a friendly creature with counters based on its power, but beyond that, it doesnt really synergize with other cards, especially those from the Final Fantasy set, but thats about to change
He's also great with RLS Legacy - Solar Galleon, giving him Evasive when you play him and then making it easier for you to get more characters onto the Legacy, making them all hard to deal with
Pause when play stops being enjoyable
For more, check out what other TCGs alongside Disney Lorcana are worth getting into and our impressions of Lorcana's Archazia's Island expansion