Neither the card nor the duelist are avalible in 2007. Strangly the duelist is but not the card in 2008. You can unlock her (yes, it's a she) by clearing the Phantom of Chaos Armytile stone challenge in the World of Chaos.
Chat with our AI personalities
http://yugioh-episodes.com You can check her
Yes, it means exactly the same name, not anything that might contain the first card's full name. So something looking for cards with the same name as 'Yubel' would not search for 'Yubel - Ultimate Nightmare'.
When Jesse gets sucked into a vortex into another world, yubel is in that world and takes over Jesse to get to jaden.
No, if the effect of "Yubel" is used on another "Yubel", you will not be able to Special Summon "Yubel - Terror Incarnate". This is because "Yubel" must be destroyed by an effect. The effect of "Yubel" that activates during your End Phase asks for you to tribute a monster, not destroy it.
No one thinks so I guess.But in Yu-Gi-Oh GX, Yubel fused the three Sacred Beast in episode 130