Yeah Ness might be relatively tame compared to the myriad gauges and moveset themes nowadays, but he's still got a lot of unique stuff:
An Up B that doesn't send up traditionally and has to be aimed at Ness, a neutral B that functions as a slow teleporting hitbox, a down b that absorbs and has an initial hitbox, and an fsmash that reflects, a dsmash and usmash that have hitboxes while charging and can go off the stage.
It's just that unlike a lot of characters his weird attributes aren't tied to a specific overarching mechanic or theme across his moveset.
I will say if he got in nowadays, he'd definitely have gotten a PP bar.
It's also a reference to Virtua Fighter's Akira, another series Sega owns.
Speaking of,
After Burner Climax is a remix of
After Burner II theme song.