Dang, I wouldn't say I like that TV. That's totally out of character. Or it just borrowed some ideas from Halo.
I don’t think it is as they are using the novel series as the basis but spinning a slightly different continuity.
Farther I would counter point that Halo liberally borrowed from a wide range of Sci-fi books and movies.
The Spartans are almost directly lifted from a 1996 movie called Soldier which was a loose Blade runner sequel. Children kidnapped trained into super soldiers by the government. They are dispatched to put down insurrections including in space. The Lead Character is named Sgt Todd 3465. Tell me he doesn’t sound like a Spartan. They also lifted part of the film’s armory for the human weapons.
The Spartan II soldiers are also based on Captain America with a little Wolverine in the mix
Mjolnir and the ODST drop pods are lifted from the Starship troopers novel, the guns and Scarabs from the movie. Would also accept Ironman.
Cortana is lifted from Ghost in the shell.
The Marines and ODST, Pelican/Condors, mech suits Sgt Johnson (Sgt Apone ) are from Aliens.
warthog, and earth vehicles are pretty much the GI Joe toy line.
Plasma weapons are from Starwars, the Halo weapon is the Death Star
The Elites are Klingons from Trek hybrid with Predator and Jaffa.
Flood are Zombies from Resident Evil or demon from Doom
The Worms are more or less The cyborg demons from Doom crossed with T1000
The Grunts are the Goblins from war hammer,
Brutes are Uruk-hai from Tolkien
the Prophets are the Systemlords of Star gate SG1 the Forerunners are the Ancients of Stargate.
The Halos are from Ringworld
The Monitor are Hal 9000 from 2001
I could max out the character count like this.
Halo is one of the least original franchises in Sci-fi but that’s not a bad thing. It took other ideas and tossed them into the blender for a unique mix.