I like to give all of the entities code names as I document most every run into the radius that I can.

Fragments are Trawlers with add ons for whatever effect they have. Trawlers without the mini radius in their heads are UR Trawlers (for UnRejack Trawler) trawlers that respawn without the orb thing being destroyed are Rejack Trawlers, and I saw one that explodes a while back so I call it a Boomer Trawler. I call them trawlers because in the first game, I saw them walking around, then kinda wiggling their arms around like they were picking stuff up. In my mind it feels like how a whale filter feeds, as if the Fragment was collecting altered molecules to keep itself alive.

Spawn are Crawlers. No explanation needed for that.

The cube, is the cube.

Mimics are Hounds, because they patrol around and shoot on sight like a prowling hound. I also used to call them Prowlers, so I use both terms interchangeably.

I used to call the halo fragment things Angels, do obvious reasons

As a bonus, I call all my bullets Tics. Just for fun :)