This is the Halo Covenant Grunt, the most basic soldier in the Covenant military.
About this creation
Grunts measure about four feet high and have a high squeaky voice, especially when speaking English. Many of them learned English from various intercepted UNSC radio messages. And out of all the Covenant, they are the only ones that I approve of speaking it.
Grunts are, well, grunts. They are treated as cannon fodder by the rest of the Covenant, and are easily disposed of. They breathe methane, so unless on a methane planet or in a 'methane suite' (rooms in various Covenant ships and cities), they must wear a gas mask and a big pointy breathing apparatus.
This little guys are rather fearful and are always getting scared. In fact, if they don't have an Elite commanding them, most of the time they will panic and flee.
I'm quite satisfied with my Grunt design. I think it captures the poster of the smallest Covenant soldiers quite well, and it is very playable. And one of the best things about it is that it is original. This design is entirely my own, though I must give credit to Sabre-Scorpion for the Plasma Pistol as well as the original inspiration.
This is a Grunt with a Fuel Rod Cannon (as opposed to the Fuel Rod Gun on Halo for PC, which is dark purple). This design is mostly from Mondaynoodle, where I get many of my designs from. The yellow is too bright, but I dreaded trying to get Lego pieces in the dull off-yellow colour that it is in the game.
With no shields, weak armour and an incredibly fast breeding rate, you slaughter these guys by the hundreds in the games, even on Legendary, while they run around waving their hands in the air, screaming things like "BAD CYBORG!", "THEY'RE EVERYWHERE!" and, my favourite, "LITTLE PEOPLE FIRST!!!".
A size comparison with Frank, my own size comparison minifig, since I don't have any Marines yet. As you can see, the Grunt comes to around about four and a half feet, which is slightly taller than it should be, and the tip of the breathing apparatus reaches about five feet (though I think that's because I took the picture at a too low angle). One of the studs on each foot can be removed to make it shorter if it needs to be.
Oh, and just wondering, there ARE blue Grunts, right?