Ryu still seems amazing to me. Probably the best character of the DLC, potentially one of the best characters in the game. He has yet to win anything big AFAIK but it's only been a week, in time I expect good Ryu players to take a lot of tournaments. I agree that he's like Shulk in that only a small amount of people will have the patience and skill to learn him to his full potential, but I think Ryu offers higher reward to his players for the time they put into him because he's more viable than Shulk. What's interesting is that in all fairness, whilst I don't expect this to happen I can see Ryu moving down the tier list because his specific weaknesses (linear recovery, poor mobility, very punishable on shield) can be abused quite easily by the best characters. If he does move down, it will only be due to the strength of certain top tiers. Overall I have very few qualms about putting Ryu in the top 10, but he doesn't crack my personal top 5 (Sheik, Rosa, Sonic, Pikachu and ZSS in that order).
I should mention that I think that, in time, people will learn to respect the **** out of Focus Attack and Ryu won't net so many kills through it. However because it demands so much respect, he will benefit from being less pressured by certain characters up close, including top tiers like Sheik and Fox.
Roy is potentially the best swordsman in the game still, but pretty unorthodox due to his sweetspot mechanics (stating the obvious I know, I just mean he plays totally differently to all the other swordsmen but is probably the most viable overall). His mobility is great, he punishes quite hard and has a very solid combo game plus some good out of shield options. I think he struggles against projectile harassment from certain characters, and his recovery is very exploitable. I see him at the bottom of high tier, maybe top of mid, we'll see how he develops. He doesn't have that "jank" factor where he can get kills off tiny mistakes at 30%, but he's ready to end you with Fsmash by the time you hit 80.
Lucas is definitely solid. I think NAKAT has proved that and I'm glad all that bottom 5 rubbish has subsided. He has a predictable but effective neutral; PK Fire and Zair are the only safe options and Lucas has below average mobility, but both of those attacks are really good options. His throw game is unreal, balanced only by his terrible grab game, but his grab is still fast enough to catch landings and punish a large number of attacks on shield. His recovery is probably better than 3.02 PM Lucas which is to say, amazing, though I'm not sure if zap jumping works in this game but he didn't even need that in PM. I think Lucas' placement is similar to Roy's, he seems like a sleeper high tier to me. I think very highly of Lucas.