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The Creatures akaKing Creature, Come King Creature, Come by(US title: The Creatures) by John Rowe Townsend, 1980.   
(I used Google's Advanced Book Search)

In search of a less restrictive way to live, two young people break away from their colony of Persons on the planet Earth, become involved with the inferior Creatures who inhabit Earth, and are thrust into the forefront of a revolution.

LibraryThing

Characters include Vector, Harmony, Helix, Node.

https://www.librarything.com/work/1562498/commonknowledge

In search of a less restrictive way to live, two young people break away from their colony of Persons on the planet Earth, become involved with the inferior Creatures who inhabit Earth, and are thrust into the forefront of a revolution.

The Creatures, we soon realize, are Earth folk like ourselves, whereas Persons belong to a superior, cerebral (and, to us, alien) race. Safe in their antiseptic outpost, Persons occupy themselves with math, music, and the Dimension Game, while Creature Guards run the Colony and protect it from the filthy, hungry Creatures who overpopulate the city outside its walls. Within the colony is a young girl, Harmony, who has picked up from her atypical Person tutor and her own independent nature some very unorthodox fellow feeling for the Creatures. And just as Harmony is about to be sent back to the home planet for breeding, she develops some most un-Personlike feelings for fellow student Vector, who tells this. At 17, Vector is about due to have the Operation (Persons on Earth do not breed); but he finds that he would rather have Harmony. And so the two sneak out to live among the Creatures, where disease and hunger are still common, hoodlum gangs take over the streets at night, and everyone lives in fear of the Guards, who have come to consider themselves a separate race above the common Creatures.

https://www.kirkusreviews.com/book-reviews/john-rowe-townsend-12/the-creatures/

The Creatures, we soon realize, are Earth folk like ourselves, whereas Persons belong to a superior, cerebral (and, to us, alien) race. Safe in their antiseptic outpost, Persons occupy themselves with math, music, and the Dimension Game, while Creature Guards run the Colony and protect it from the filthy, hungry Creatures who overpopulate the city outside its walls. Within the colony is a young girl, Harmony, who has picked up from her atypical Person tutor and her own independent nature some very unorthodox fellow feeling for the Creatures. And just as Harmony is about to be sent back to the home planet for breeding, she develops some most un-Personlike feelings for fellow student Vector, who tells this. At 17, Vector is about due to have the Operation (Persons on Earth do not breed); but he finds that he would rather have Harmony. And so the two sneak out to live among the Creatures, where disease and hunger are still common, hoodlum gangs take over the streets at night, and everyone lives in fear of the Guards, who have come to consider themselves a separate race above the common Creatures.

Kirkus Reviews; emphasis added

The Creatures aka King Creature, Come by John Rowe Townsend, 1980.  (I used Google's Advanced Book Search)

Characters include Vector, Harmony, Helix, Node.

https://www.librarything.com/work/1562498/commonknowledge

In search of a less restrictive way to live, two young people break away from their colony of Persons on the planet Earth, become involved with the inferior Creatures who inhabit Earth, and are thrust into the forefront of a revolution.

The Creatures, we soon realize, are Earth folk like ourselves, whereas Persons belong to a superior, cerebral (and, to us, alien) race. Safe in their antiseptic outpost, Persons occupy themselves with math, music, and the Dimension Game, while Creature Guards run the Colony and protect it from the filthy, hungry Creatures who overpopulate the city outside its walls. Within the colony is a young girl, Harmony, who has picked up from her atypical Person tutor and her own independent nature some very unorthodox fellow feeling for the Creatures. And just as Harmony is about to be sent back to the home planet for breeding, she develops some most un-Personlike feelings for fellow student Vector, who tells this. At 17, Vector is about due to have the Operation (Persons on Earth do not breed); but he finds that he would rather have Harmony. And so the two sneak out to live among the Creatures, where disease and hunger are still common, hoodlum gangs take over the streets at night, and everyone lives in fear of the Guards, who have come to consider themselves a separate race above the common Creatures.

https://www.kirkusreviews.com/book-reviews/john-rowe-townsend-12/the-creatures/

King Creature, Come (US title: The Creatures) by John Rowe Townsend, 1980. 
(I used Google's Advanced Book Search)

In search of a less restrictive way to live, two young people break away from their colony of Persons on the planet Earth, become involved with the inferior Creatures who inhabit Earth, and are thrust into the forefront of a revolution.

LibraryThing

Characters include Vector, Harmony, Helix, Node.

The Creatures, we soon realize, are Earth folk like ourselves, whereas Persons belong to a superior, cerebral (and, to us, alien) race. Safe in their antiseptic outpost, Persons occupy themselves with math, music, and the Dimension Game, while Creature Guards run the Colony and protect it from the filthy, hungry Creatures who overpopulate the city outside its walls. Within the colony is a young girl, Harmony, who has picked up from her atypical Person tutor and her own independent nature some very unorthodox fellow feeling for the Creatures. And just as Harmony is about to be sent back to the home planet for breeding, she develops some most un-Personlike feelings for fellow student Vector, who tells this. At 17, Vector is about due to have the Operation (Persons on Earth do not breed); but he finds that he would rather have Harmony. And so the two sneak out to live among the Creatures, where disease and hunger are still common, hoodlum gangs take over the streets at night, and everyone lives in fear of the Guards, who have come to consider themselves a separate race above the common Creatures.

Kirkus Reviews; emphasis added

1
source | link

The Creatures aka King Creature, Come by John Rowe Townsend, 1980. (I used Google's Advanced Book Search)

Characters include Vector, Harmony, Helix, Node.

https://www.librarything.com/work/1562498/commonknowledge

In search of a less restrictive way to live, two young people break away from their colony of Persons on the planet Earth, become involved with the inferior Creatures who inhabit Earth, and are thrust into the forefront of a revolution.

The Creatures, we soon realize, are Earth folk like ourselves, whereas Persons belong to a superior, cerebral (and, to us, alien) race. Safe in their antiseptic outpost, Persons occupy themselves with math, music, and the Dimension Game, while Creature Guards run the Colony and protect it from the filthy, hungry Creatures who overpopulate the city outside its walls. Within the colony is a young girl, Harmony, who has picked up from her atypical Person tutor and her own independent nature some very unorthodox fellow feeling for the Creatures. And just as Harmony is about to be sent back to the home planet for breeding, she develops some most un-Personlike feelings for fellow student Vector, who tells this. At 17, Vector is about due to have the Operation (Persons on Earth do not breed); but he finds that he would rather have Harmony. And so the two sneak out to live among the Creatures, where disease and hunger are still common, hoodlum gangs take over the streets at night, and everyone lives in fear of the Guards, who have come to consider themselves a separate race above the common Creatures.

https://www.kirkusreviews.com/book-reviews/john-rowe-townsend-12/the-creatures/