Riku gets the Darkness Keyblade in Kingdom Hearts, made purely out of his Darkness. He loses ability to wield a Keyblade for a while, then he gets the Soul Eater Keyblade in either the beginning of Chain of Memories or the end of Kingdom Hearts, I'm not sure which. He get's Way To The Dawn after choosing the Path To Dawn at the end of CoM, or RE: CoM. Those are his only three keyblades.
Whether a keyblade is 'better' than the other is slightly based on opinion. If you're asking what the strongest keyblade is, then the answer is the Fenrir Keyblade which is achieved by defeating Sephiroth.
Keyblade Wielders can wield a Keyblade. Keyblade Masters can too, but they have also passed the Mark of Mastery test.
Riku
If you mean keyblade as in Kingdom Hearts than I assure you that it is a mod that is installed from the internet.
riku was one year older than sora.sora was 14 years old and riku is 15 years old
Its Kingdom Hearts 368 days/2 Its harder than Kingdom hearts 2 but its fun. Especially the ending (spoiler! Spoiler!) Roxas gets a second keyblade and fights Riku Roxas gets defeated and its game over
dawn has more bubbles than joy because many people like dawn because it is more romantic than the other one
As you progress through the story, characters will give you keychain that give your keyblades different forms. you should get a keychain from every world. Some keychains are achieved in different ways than just being given to you. After the Monstro world is complete, go to traverse two and you should be given a keyblade when you meet Gepetto and pinnochio. The Oblivion keyblade is in a chest just above where you verse Riku the second time in hollow bastion. And the ultimate blade is forged through synthesis by gathering rare materials. I think you might get one from defeating Sephiroth too.
you can't if your doing the demo other than that i don't know P.S-at least i hope you CAN get him in demo!
Kairi uses a keyblade for only one scene in Kingdom Hearts 2, and the name of the keyblade has never been mentioned nor has anyone in the game really acknowledged that she was using one. The creators of Kingdom Hearts say that Kairi is able to use a Keyblade due to the strength of her heart which leads fans to speculate that Cinderella, Aurora, Snow White, Alice, Jasmine, and Belle may be able to use Keyblades as well.
You just get exp points, there is no video or anything afterwards which sucks
I'm assuming your asking who does Sora care for more between Kairi and Riku, well, it is more of an opinion. I, personally, say Riku. Part of this is because he chooses to continue looking for Riku, rather than being with Kairi, or bringing Kairi along to find Riku. Though, perhaps he desn't want Kairi to get hurt, hwich is quiet a tossup. The other part of why I say that is because I <3 yaoi, but lets not get into that (but feel free to talk to me about yaoi on my message board ^.^)