There is at least one (that I am aware of). It is called Adventure Time: Battle Party and it is released by the Cartoon Network. You can find it by clicking this link.
yes
How To Train A Dragon.
EB Games
No, the Vita's browser can't play flash-based games.
Game on the Intarwebz Browsar (Games on the Internet Browser, like IE and Firefox.)
Well this game can't be played in browser as far as I am aware, but it is still a really fun rts game. Its called League of legends.
Yes, its one of the best MMORPG browser-based games.
try monster ranch. there quite good.
Generally, yes. But there are some games (MMORPGs, Flash games and such.) that are browser-based, and require no installation.
Miniclips may refer to the games available on the website Miniclip. It is a privately owned company that offers browser based games, as well as mobile games.
If you're talking about browser based games, try some of the others made by Artix Entertainment. If you meant Sci-fi games try some actually downloadable games, if you wanted a game that was generally fun try League of Legends. Whenever I get the chance to play it, I do because of how much fun it is.
No, there is no online fighting game based off the Legend of Zelda series. Nintendo will likely keep the series to adventure-based console games in the future, as well.