Hes a bit strange, I mean, hes dad is captured by nagas, the woman next to him is Onyxia, Highlord Bolvar Fordragon sounds like being a dragonslayer and hes standing next to the black dragonflight queen.

Hes family was never normal.

You can't kill kids in World of Warcraft, thus even the "king" is immune to death.

You can't attack this NPC if you're a horde.

I can't believe a 6 year old kid is taller than my Gnome... That's just not right.

if you do succeed in beating Bolvar, Anduin becomes attackable.

There's quite a lot of lore in the game surrounding his capture.

The missing diplomat quest chain is the first hint.
Another chain which seems to follows on from this chain in terms of lore begins in dustwallow with a disturbing development, leading on to Jaina Must Know and finishing with Return to Jaina.

The first chain lets us know that some important diplomat has been kidnapped, and that the defias are involved. It turns out the king is missing. The next chain shows us that the defias have been in dustwallow, and have captured an important prisoner. It also tells us that person is captured on Alcaz island.

We also find out that someone high up in the ranks in stormwind is working against the alliance. This is of course talking about Lady Katrana Prestor, who happens to be onyxia in disguise. There maybe more lore relating to this that I have not yet come across, but it at least hopefully explains why the king is in a cage on alcaz island :)

EDIT: This post was initially in response to a comment which has since been removed. You are quite correct Shelireih, however in it's initial context this post made sense. If my hazy memory serves me right, I believe there was no page for Varian at the time, so a lot of discussion on him was on his son's page instead.

I do remember seeing the real king of SW in alcaz island pre bc and noticed they took him out of the game, anyone know where he went and remember his name? cause i surly forgot over the past months/year

Spoilers:

According to the current in-game quests and the Warcraft comic series, Varian Wrynn, escapes from the Defias during transport from Alcaz Island. He winds up on the shore of Durotar in an amnesiac state and is captured and entered into the Dire Maul gladiator tournament. Not knowing his own name, he is given the title Lo'Gosh (a legendary white wolf). After winning the tournament and a number of other adventures he rediscovers his identity and is attempting to return to Stormwind to reclaim his title and be reunited with his son.

Currently the rumor is that the Missing Diplomat quest line will be completed when the comic series reaches it's conclusion.

This kid isn't actually the stormwind faction leader. if you look around him you should see Highlord Bolvar Fordragon (http://classicdb.ch/?npc=1748) who is given 'leader' staus. Stormwind is led by him. Not by anduin.