No, Riku does not love Xion. Xion is Sora's lost memories, so he wants to help Xion to help Sora.
No, Riku and Xion only share some conversation in the new Kingdom Hearts 358/2 Days game.
Causes he know that she is a part of sora that why
She is in various places with Riku
Kingdom Hearts 358/2 Days spoilers:Xion first met Riku at Beast's Castle, during a mission she had with Roxas. They had a fight there over who's right; Riku, which claiming Xion and her key-blade are fake, or Xion, who is getting mad at him for calling her this way and says he's the one acting fake. He knocks her and leaves the place, while Xion is on the ground, defeated, and screams in pain.Later, Riku had seen cradling a painful Xion in his arms, back at Destiny Island. Xion had a nightmare about the scene in Kingdom Hearts Chain Of Memories, where Zexion gives Riku an hurtful speech about how he destroyed his home and forgot his friends. When Xion awakes in Riku's lap she asks him who is he. He answers his name is Riku and that he's Sora's friend. He tells her who she really is, and she asks if he hates her for rubbing his friends away from him. He answers that he does not hate her, but he is sad. She apologized, saying that she still don't want to disappear so he gave her time to think.In one scene Xion's hugging her knees, looks like she's crying in her bed, back at The World That Never Was, and asks: "What should I do... Riku."The two also later shared a conversation in Twilight Town.
Although there is no way of knowing for sure, it's understandable to assume that Roxas threw the keyblade at Riku because of Xion. Xion could have thrown the keyblade to Riku so that Riku could stop Roxas. Through Roxas, Xion was able to give Riku the keyblade. I know it's very complicated but, hey, that's what Kingdom Hearts is all about. Another explanation could be that Roxas wanted a challenge from Riku, and to make things fair, he tossed him a weapon, ensuring that Riku would fight Roxas in a fair way. Again, there is no way of knowing exactly why the Keyblade was thrown. These are just a fan's ideas.
Defeat Riku (after Xion)
Axel was ordered to stop Xion from betraying the Organization. Xion was important to Organization XIII and their plan on harnessing the power of the Keyblade, so when Xion was informed by Riku of Org. XIII's plans, Axel had to stop her from further interfering.
i have no idea, but personally, i think he might have like xion ,in 358/2 days for DS
OF COURSE RIKU NEEDS A GIRLFRIEND! Luckily since I'm making a book based on Kingdom Hearts( Sorry Tetsuya Normura,I was going to give a good idea for you) my main character (NOT SORA) Mitsuki Hikaru will be Riku's girlfriend.
The King, Sora, Goofy, Riku, Xion, and Donald
The Keyblade Wielders are Sora/Roxas/Xion,Kairi,Riku, ,Ventus/Vantais,Terra,Aqua,and Master Equas
yes