The above autonomous, presentient, unmanned institutions are called "plexicals" and they form the backbone of 30th century infrastructure. They have totally alien, almost Lovecraftian minds and are not self-aware in a recognizeable human sense. They lack human personality and speech capacity because they are not biological. They communicate almost entirely in rules, results, behavioral cues, media outbursts (cut-ups?), and information.
Be wary of letting Alba's relationship with Haruki seem sexist -- keep in mind she's the practical, ambitious, mechanically inclined, assertive one, and is easily his intellectual equal, even if she is a "pet." This is a big chance to demonstrate that submission != inferiority.
Strictly speaking, Alba is "fair game." She's a game construct and has no more civil rights than a set of Quake-model polygons. Alba is composed of something other than ordinary flesh, perhaps some sort of artificial biomaterial that's based on an alternative to DNA? Try to avoid Blade Runner cliches here. Instead, use her as a metaphor for people who live healthy but illegal lifestyles.
In an early conversation, Haruki is faced with some sort of minor problem -- a bill, a piece of paperwork, a transportation need. He's dismayed and annoyed to find that there's no community support structure on Terra -- no government programs, no communes, no free hoverbuses, maybe not even traffic signals or publically owned streets.
Haruki gradually meets people from Terra's guerrilla ontologist community, various day-glo culture freak types. Emphasize that these people do not and probably could not exist on Luna. Also make it clear that they are not heroes but they are a positive and healthy consequence of Terra's ambitious hyperindividualism -- i.e., they're not living apart from mainstream Terran society. Question the idea of the mainstream -- make most of these "freaks" respected, trained, licensed professionals. Mood engineers, spirituality resellers, professional oracles, executive Otherkin, stock analysts who play the gender market, monasticized orders of performance artists with life-long scripts, metareality TV producers (like Haruki's bosses, who should actually be pretty cool guys), nomadic game designers (shoutout to Tamaghaz folks), collective memory sysops. In particular, make the most of the idea that this society has a Ribofunk-like understanding of the chemical, cybernetic/informational, and metaphysical basis of moods and thought. Sharing a unique experience or paradigm to somebody should not only be a technical/artistic possibility, it should be a teachable and well-compensated skill...
Imply that Terra's decentralized, desocialized culture has evolved some transmodernist, chaos-system based substitutes for old functions of society, and that this has both good and bad consequences. Ideally, the whole series should be readable as both a fluorescent manifesto and a repudiation of the founding ideas of fluorescence.