Halo

Halo is basically a Sci-fi first person shooter that started in the first Xbox. It is also the franchise that pretty much saved Microsoft from Bankruptcy. Unlike most Sci-fi Halo is pretty grounded, although the levels get really high once we are introduced to the Forerunners, who have Moon Sized weapons that can bust planets and of course the Halos that can trigger a wide beam that covers 25,000 Light years and kill anything sentient by inducing some chain-reaction that is unknown.

Master Chief's shields
According to the Halo 2 manual, Master Chief with everything on, from his armor to his own weight, weighs 450 Kilograms. Human Terminal Velocity at its lowest is considered to be 54 M/S, however I am going to go with the highest ever recorded and probably the one that is the most realistic for Chief, the guy who fell from orb it himself and broke the sound barrier. He was going at 377.1 Meters per second. I simply inputted the values in a relativistic calculator, for the 377.1 M/S Chief endured 32 Megajoules when he hit the ground. For the low end he would have to endured 656 KILOjoules. To put this in DC the minimum to bust a small building is 21 Megajoules, which is also around the same energy released from a round of as Abrams Tank. 656 Kilojoules is around 1 or 2 Grenades exploding, depending on the size of a grenade since really huge ones can release 800 Kilojoules. Personally I go with him going at 220 M/S which comes around at 11 Megajoules since there's no way he can endure a tank round and live, but just giving a high end for him. In case someone decides to bring up re-rentry speeds, those only apply to really large objects. Human Terminal Velocity barely breaks the sound barrier, but if Chief did fall at Mach 25 speeds that would mean he endured around 16 Gigajoules, which is 4 tons or basically Large building Level. Too many instances of Chief's shields actually place it lower than his fall from orbit, the feat itself actually has other reasons than just Chief falling straight down (He actually had a part of a ship for cover and made himself fall in a curve rather than just a drop) But yeah, Gigajoules shouldn't be used for Chief.

Covenant Plasma
in-canon 1 to 2 direct shots can bring down the shields of Chief's armor. So yeah, divide any of my answers by 2 and you'll get the following: 16 Megajoules for high end, 328 Kilojoules low end.