Giants....

[Celegost]

Apparently, the Numenorians had help from giants when constructing Helm's Deep, so maybe not all giants are evil...

And what do giants look like?? The giants on the Battle for Middle-earth II look like tall long-necked trolls but im guessing that they look more like the ones in Harry Potter

[The Might]

Well, I don't want to speculate, but I see them as...well...large men
Perhaps the Giants in earlier writings might have had an ogreish look, due to the fact they were counted among the Uvanimor alongside ogres and trolls.
However, just as Hobbits are a smaller version of Men, Giants are a bigger one, or at least so I see it. As hobbits have their curly hair and hairy feet, giants might have some differences of their own, still I doubt there would be a striking difference. But, as I said it all is speculation.

As for Helm's Deep, I think you misunderstood Tolkien.
"Carved by the hands of giants" or how Helm's Deep (just like Minas Tirith) is described doesn't actually mean that giants helped the Numenoreans, it's just a metaphor to make you picture the size and strength of the fortress.

[Raynor]

I would also argue for a metaphorical interpretation of this giants refference. After all, the woses thought that the numenoreans ate stone , which is another statement which is, obviously, metaphorical.

[Selmo]

Originally Posted by Raynor

After all, the woses thought that the numenoreans ate stone which is another statement which is, obviously, metaphorical.

I don't think that the the Woses thought that Numenorians ate stone or that they were making a metaphorical point. It was simply a joke among the Woses.

When I was three years old and frightened by thunder, my father told me that noise was made by giants playing skittles in the clouds. He wasn't trying to teach me a truth in metaphorical form, he was making a joke to ease my fears. I'll take Gandalf's comments on giants in The Hobbit in the same way.
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[Mattius]

I always thought of their mention as metaphorical. When the Dwarves, Gandalf and Bilbo are on the mountain path in the storm Thorin (I think) mentions that he doesn't want to be picked up by a giant and kicked like a football. Perhaps they were once real creatures and by the time of the Hobbit were mythological and used in reference to such situations when there were avalanches in the mountains.

[Legate of Amon Lanc]

I always thought of their mention as real. When the Dwarves, Gandalf and Bilbo are on the mountain path in the storm, Thorin indeed mentions that he doesn't want to be picked up by a giant and kicked like a football. But few sentences before Bilbo takes a peek out of their shelter and sees the giants throwing stones, and they all hear them laughing*.

But I don't believe they were on Caradhras (as I said before).

*If some of you read On Fairy-stories, it might also be of some concern what Tolkien says about Thor...

[Mattius]

Originally Posted by Legate of Amon Lanc

I always thought of their mention as real. When the Dwarves, Gandalf and Bilbo are on the mountain path in the storm, Thorin indeed mentions that he doesn't want to be picked up by a giant and kicked like a football. But few sentences before Bilbo takes a peek out of their shelter and sees the giants throwing stones, and they all hear them laughing*.

But I don't believe they were on Caradhras (as I said before).

*If some of you read On Fairy-stories, it might also be of some concern what Tolkien says about Thor...

But is this literal or metaphroical? Perhaps 'seeing' the giants throwing stones is the boulders crashing down the mountain and the 'laughing' is the sounds they makes mixed with howling wind and rain.