He doesn't but it would be funny if he did!
Chat with our AI personalities
The thing on Deidara's eyes is an eye scope. It is used for watching and spying and it is helpful for him because it can view from far-away distances. The above things are true, but he originally built it to combat the sharingan, due to his hatred of Itachi and other Uchihas.
Tobi was there with deidara. He helped at first, but when deidara used C4 karura, Tobi ran away
Nothing happened to it. When he had a fight with Itachi, itachi used a gen-jutsu. Dei lost to itachio because of the gen-jutsu. Deidara 'trained' his eye to 'see' gen-jutsu .
Yes, there are lots of people who like Deidara; based on the results of one of the latest Naruto character polls of which Deidara placed Third I would say so (and yes I'm a fan of Deidara)
Katsu (喝) is what Deidara says to detonate his exploding clay.