Ok so that was a horrible answer to my suggestion "At least say no I hate Cloud" or "I love Shulk too much dropping him is not an option" I am giving an answer from a competitive standpoint. I feel like Cloud is superior to Shulk in most areas meaning that he would probably better to play with a Villager. I would like to add that the 55:45 matchup Rosa VS Shulk is false according to Dabuz's MU chart Shulk is dominated by Rosa (I don't have exact #s) Cloud would help with that matchup. In short either give me an answer/reason for why you pick Shulk over Cloud or say it is a personal loyalty/hatred
Don't give trash.
Moving on
"Hey, I'm a cloud main. I found that a lot of the players I fight don't do well against solid defense and projectile play. I've been thinking along those lines for a secondary, who would you recommend" I apologize I know my advice might be a bit drastic but at least read and consider it with an open mind. I am going to be frank, Cloud is not an excellent solo main, he is actually a bad one. I personally would not advise using Cloud as a main in general. Cloud is viewed by the smash community as a godlike secondary. I would find a new main and use Cloud as a pocket or secondary. Since Cloud covers so many MUs I would find a tech heavy main who differs from Cloud like maybe a Sonic, Villager, Pikachu, Metaknight, ect.
If you think I am crazy then you could do a different path, if you want to continue maining Cloud then I would use Megaman. Megaman is a god a even matchups and is more of a projectile and defensive playstyle. I am not going to lie, Cloud has not very many advanced tech skills and advanced combos. So you have plenty of time left over, So going someone with some "wonky tech skills" I would say is a good idea.
Nice_FZPSC.42
Ok mate don't give the poor guy false information just because you want to look like you know what you are talking about.
Are the projectile characters so one of them. First of all I wouldn't give him Samus becuase her projectile game is really bad. the Only decent projectile she has is Charge shot and the rest of her projectiles are just one trick ponies so I would not include in the list. If he wants GOOD projectile game supporting a defensive playstyle I would say Robin, Villager, Megaman, and TL. Also you forgot Link in your list. This is such a lazy answer because you should also look for compatibility with Cloud and other match ups before making this list.
Ralugi
Ok So please tell me you were sick the day you wrote this
"I'd chop that list down to Villager and Robin. The rest have some wonky tech"
So lets look at this Robin is crazy complicated He call for exteme situational awareness and knowledge of different jabs hit boxes different neutral Bs and Aerials with Thoron. Villager has some crazy tech, his infinite, aerial strings, rocket setups and defensive tree plays with the crazy woodchip combos. Ok and When does Samus have some "wonky tech" (In comparison to Villager and Robin) Seriously man are you kidding me? the rest I can agree on with your assesment of tech.
Bottom line for you
Ralugi
Most characters with heavy projectile game are going to be tricky to use and have amazing tech and setups, there is not really any way around it.
Nice_FZPSC.42
and @Ralug Take more time and effort into your answers and try to be constructive on the forums or just don't talk at all. I repeat
"Don't give trash"