1.) Rich Boy's abilities via "Let's Get This Paper" is nowhere near Kendrick tier and is a pretty bad example.  Judging by your musical taste, I assume
Kendrick's voice may annoy you?  Rich Boy is no different.  Even with proper mixing, Rich Boy slurs during his flows and he never took the time to expand as an artist.

2.) 50 Cent DID start trouble for no reason.  Check his credentials.  Not because it was cool or trendy at the time but he simply did it because he felt he was cool enough to pull it off.  He dissed sooo many artists:  Rick Ross, Chris Brown, etc. the list goes on.  I can't think of any other artists that dissed more stars than him (excluding Trap Music IE: Gucci, Boosie, etc.)  I'm glad Kanye shut his ass down.

3.) Jay's lyrics have always been terribly materialistic.  He hasn't gotten worse with time.  If anything, he's become more mellowed out and is balancing out his suckiness IMO.

4.)  You should really expand your horizon dude. 
I don't understand how you feel people who enjoy Kendrick Lamar's music have bad judgement on rap but you openly enjoy 50 Cent and Rich Boy for crying out loud!  I'm not saying you should hop on the Kendrick train but I can honestly tell that you have a lot to learn about Hiphop.  Branch away from mainstream jumbo and find something that catches your ears.

- "Let's Get this Paper" was all about its wondrous production but that's where everything ends.  Rich Boy has always been an Ok emcee.  His styles were limited, he wasn't very lyrical and his flow was pretty basic, hardly ever stepping out of his shell to do something different.

- 50 Cent hasn't been relevant since "Get Rich or Die Trying LP".  His bars involve him threatening without basis and slaving for the industry (Being a walking advertisement for fashion labels, promoting crime, gang affiliation, prostitution, etc.)

- Jay-Z has always been the media's Golden Boy, the face of High Class modern day Hiphop and for good reason.  He knows how to advertise what he wears and what he did.  Jay constantly raps about clothes, how he was in the streets but now he's got money so no one can touch him, how he's able to get any woman that he desires, etc.  He's the perfect industry rapper IMO and that's why I don't think I'll ever see eye to eye with him.  His lyrics are Ok but in reality, it's his success as an entrepreneur, business man and his overall ability to promote what the media wants to be "in" that I feel ultimately led to his fame.

- I like Hopsin's flow.  I've actually listened to everything he put out so far.  I usually grimace at the thought of listening to new and upcoming artist but his flows aren't bad persay.  I do have a hard time taking him seriously due to his attitude and overly comical puns.  With enough effort he may adapt and settle into a comfortable style if he continues to put out music.

Looks good Balth.

- His basic attacks shouldn't necessarily be "normal" (IE: Using his tentacles to attack, quick horror-esque telekinesis, Slenderman could have powerful HP/HK attacks using his hands though)

- His specials/hypers can involve his pages (pages can be trap-like projectiles (IE: Blaque by XCB or White from KOF), tentacles, teleportation and maybe counters too.

- Lvl. 3 can be Slenderman flinging all 8 pages around the arena in which p2 must collect in order to prevent the Lvl 3.  If p2 doesn't collect them all, Slenderman would perform his signature "tentacle rape" complete with static and all that jazz.  If p2 has collected a sufficient amount of pages, then the damage could be reduced.