I have already replied this in the
Roy Social thread, but I think it will be more helpful here.
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Hi Mason,
I will try to reply your post based on mi little experience on playing Roy in this game. First of all, I wanna you to know that I only play Roy five times I believe —actually I only play Smash 4 like... less than 30 times for sure—. As I said in my presentation, I haven't a Wii U nor a 3DS, so yeah, I play when I can. Anyway, I wanna share some thoughts about Roy, matchups and stages.
First of all I wanna talk about his playstyle. I think the best way to play Roy is a agressive-pasive way. I get good results playing close to the oponents and cover myself with the shield or just standing there, and wait for the oponent reaction. If he roll, punish that; if he jump, go after him to keep the pressure; if he attack you, shield grab... and so on. People just get nervious having a Roy in their ***, and it's a normal reaction. Roy is pretty scary. Sadly I cannot offer you info or advices against campers chars, because I didn't know that matchups, but I guess that that tactic could work, but it will be more difficult.
Another thing you should notice asap is if the openent tech the Fthrows or no. If they doesn't, I think Fthrow to Dash Attack will hit at almost every percentage, and Dash could kill easy around 130% or even less. If they tech, I think the better option to follow up a Fthrow is a SH Nair. Nair will raise the oponent in the air and you can follow it with another Nair. Pretty good option.
About his MUs, I cannot say to much. I only will say that have a decent MU against Rosalina. I play A LOT against Rosalina and it may be around 50:50, even with a little advantage for Roy I must say. She is very light, and Roy hits pretty hard. With rage, you can kill her with 40% if you Fsmashed her close to the ledge. Anyway, you must be aware of some things. She can gimp you easyly, but with a little of practice you will learn how to dodge it —try to not go too deep, Rosalina's Dair kill you at 30% if you are without jump—. Use the Upb horizontal, or trying to hit Rosalina in the process —but not from below, ofc, because her Dair will hit you before your sword hit her—. Another thing that Rosalina has are the Uair chains. She will kill you at 50% if you get hit twice in a row. Dodge them could be hard —very hard tbh—, so try to jump and go horizontal as much as you can. Reverse Sideb could be usefull in this scenario. Maybe you will be hit by a Bair or a Fair, but everything is better than two Uairs.
A MUs that was difficult for me was Toon Link. His spam is very good, and can zone you very much. Use the high Roy's speed to keep close the him, and try to not get hit too much in the process. Once you are close, you can hit in his face a few times before he runs away again. And if he stay and fights you, keep in mind that you probably will win that fight.
About the stages, I feel very confortable in Lylat and Smashville. Plataforms are goods for Roy, but I think that not too much as for other chars. Actually, against Rosalina I recomend to pick Final Destination. No plataforms = no Uair chain = one thing about not worrying. Try to avoid Battlefield, Town & City and Dreamland if you are playing against Rosalina in general, she will get a lot more of these stages than you do. Duck Hunt is a decent stage for Roy as well, but you sould avoid that if the enemy has a good gimp option —like Sheik's Fair or Downb, for example—.
I don't know what more to say. I'm probably missing something, but I still hope that my experience helps you
