Trieste SP
Smash Champion
You're right, his frame data is mostly better than Lucina's. One factor is the size of the mii you're using. I also agree that his uair and dair are good moves.Mii Sword's frame data is generally better than Marcina's I'm pretty sure. Maybe not necessarily on startups, but he has link's old jab and utilt/usmash/dtilt are all low endlag. Hero's Spin is also I think a frame 8 kill move usable off jab1 or OoS.
Uair and dair are also pretty good moves tbh