Lucina is always the Top Waifu. Plus some people think her shitty sword allow her to have a more "aggressive" playstyle but I'm 99% sure you could do the same with proper spacing/zoning with Marthy-pan. Either way good luck, and with their frame data you'll need it.

Roy hasn't gotten much results in high-level play yet, but I still stand by my anime husband. Higher tier than Marth at least. As for Lucas, yeah he's not top tier like Ness. Most of the DLC characters (except for Mew2, who is debatably low mid/high low) are considered either low high or high mid iirc. I think Lucas is generally the lowest of the three second-waves. Idk.

[s]we all know you're gay furry trash don't worry[/s]