Note: I’m talking about their physical traits and not their armor.
In Halo 5, I would like to see some diversity in the Covenant ranks. Over the years the Covenant designs have changed, based on improved graphics with each game, but now we’ve leaned that some of these changes are a result of diversity. Sangheili, like humans, come in different colors and have different features based on regions of their world. For years we’ve seen human diversity in the games but for the Covenant species we only get to see one character model equipped with different armor to differentiate them. Starting with Halo 5, I want to see different types of Covenant species all on the same battlefield.
The Arbiter, Thel 'Vadam, for example is going to be in Halo 5. The Kilo-Five series does confirm that Elites from his State have much darker skin than say, the Elites from the State of 'Mdama. So if we see Elites on the Arbiter’s side in Halo 5, then they should look like this. Jul 'Mdama is still a major enemy in the series and when we see him in the game he and the rest of his Elites should look like this. Not only does this show that not all Elites look the same, but it also helps identify friendly and enemy Elites. Of course their armor configurations will also help with that.
The Elites aren’t the only species in the game that could benefit from diversity as there are three different types of Jackals known to us. Ruuhtian, Ibie’shan, and T’vaoan. Instead of just picking one design, I say we use all three.
Ruuhtian
These can be your Jackal sharpshooters armed with Carbines and Beam Rifles.
Ibie’shan
These can be your standard infatry armed with Plasma Shield, Plasma Pistol, Needler or Boltshot.
T’Vaoan
Skirmishers. They should be just as they were in Halo Reach. Fast, agressive, leaders.
There are at least two different types of Grunts as well, but no names have been given to these variations. I think to help differentiate between possible allies and enemies, we can give the Arbiter’s faction your classic Grunt design and Jul 'Mdama can keep the new design. Either way I at least want to see different types of Elites and Jackals in the same game. With improved technology and the game which is still at least 9 month away, I think they can take the time to give us different character models for alien forces.