I do like the idea of dragonflies, but I think a giant worm (like the orespawn one but different in how it acts) that is about 3 meters long and a meter tall that will be in like a 3x3 tunnels made by them, like a mine shaft cave. It should be neutral like the new 1.10 polar bears, if you get to close it attacks, or if you hurt it, it hurts you. I think maybe the same damage silverfish do, cause worms don't have very good biting jaws for attacking. They could also spawn anywhere where it's dark, so at night they can spawn at the surface (just like real worms come to the surface at night) but at day or when its too bright, they burn up (because if worms don't get to cool shady places, they dry up). So they spawn and act when they burn like skeletons.
Fireflies also would be cool. IRL there is a variant of the firefly that eats male fireflies, so this giant firefly could do 1 heart easy, 1 1/2 hearts normal, and 2 1/2 hearts hard. It could also be 3 meters long, 2 meters high, and fly with a little bit of light coming off of it. It should spawn at night because in real life, at night these fireflies will flash on the ground to attract males, and then eat them.
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Yeah it sucks that people hate the 1.9 update people even say minecraft 1.6.4 was better then 1.8 and higher. I love the 1.9 update it adds more to battling and makes PVP more interesting, and like some people said younger/older people grew up with games that were really simple with battling. I had it hard when I started minecraft so I think 1.9 is a major update not just for combat but also for the brand new end islands, plants, and mobs. People who say 1.9 is bad or the worst minecraft update and stuff like that don't know what real gaming is about.
Anyway I like 1.9 and its a big step for minecraft and i am hoping for more awesome stuff in the updates to come.
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This is my way of doing it. Make a scoreboard that will test if any players killed a zombie and make it so they can only kill a max of 7 zombies. Then make a area that tests if that player has 1 kill or more and if that player does it will take 1 score away and add it to the pigs score. Then every time the player walks in to that area then 1 score will be added to the pigs score until it gets to 7 then opening the door. Its sorta over complex and not very automated but it might work.
(BTW this is my first post so yeah xD)