Protagonists

The Player

Identical Grandson: The human character in a nutshell, compared to the human hero of the Great Blank. Mother Trinity takes this just about as well as you'd expect.
Kid Hero: The default HUmar looks to be about Sarisa’s age.
O.C. Stand-in: The default HUmar (he's the kid with the red jacket standing above the logo in the example image above) is set up as this in the opening FMV; he stands in for the player's character.
With This Herring: The CAST character's storyline essentially boils down to this. A grand hero before the Great Blank, you tear up Mother Trinity's shit like nothing else until she bails to Arca and Photon Noises Coral. Due to the aforementioned, you are forced to shut down to avoid a literal BSOD. Waking up in the present day, you show all the aftereffects of Photon Noise exposure and have to reprogram your combat skills from scratch. Mother Trinity is none too happy to find any of this out.

Kid Hero: Sarisa doesn't seem all that old.
Light Is Good: Dresses in white and it the leading heroine.
Magical Girl Warrior: Sarisa's much like this, considering that she is a soldier of the newman race ... yet often comes off like a Magical Girl in combat. That her rod looks like something right out of a Magical Girl anime only enforces this.

Disney Death: Kai, who appears to sacrifice himself fighting off monsters in the Makara Ruins. He sets up the Big Damn Heroes and The Cavalry moment toward the end of the story.
The Drifter: After his Dark and Troubled Past, Kai became this before he settled down in Dairon City and joined the Hunter's Guild there.
The Mentor: If your character is human, he's the one who trained you prior to your official acceptance into the Hunter's Guild.
The Pioneer: Kai happened to be this in his childhood. He related his Dark and Troubled Past in the form of an unrelated story to the player character and Sarisa. Only Ogi realizes that Kai was talking about himself. Something of an informed stupidity moment on the part of the player character though, as many players cottoned on very quickly indeed.

Body Surf: He, like Zero's other CASTs, can do this to an extent; compared to the Androids and CASTs from other games, the head is the only critical component of his body. A CAST can swap bodies just by detaching their head and mounting it on another body.
Distracted by the Sexy: He of all people suffers this when he first meets Ana. Sarisa punishes him for it.
Friendly Sniper: Professional though he is, Ogi is also rather personable. Kai comments on Ogi's glibness in the Human mission "Clockworks," where Ogi doesn't seem all that bothered by the fact that Octo Diablo had just eaten his entire body save for his head just earlier. He shows the same attitude in the newman and CAST versions of said mission too. He ties with Kai for the title of 'Most Personable NPC'.
Light Is Good: White is part of his color scheme and is one of the heroes.
Transformation Sequence: When Ogi gets himself a new body on the moon, he really likes it.

Buxom Beauty Standard: Ogi makes mention of the fact that she is quite well-endowed for a Newman. Sarisa is not pleased.
Dark Is Not Evil: She wears dark clothing and leads the resistance.
La Résistance: Ana is the leader of the newman resistance on the moon.

A God Am I: Subverted, because she's the host of Dark Falz itself.
As Long as There Is Evil: Mother Trinity (and Dark Falz by extension) can keep returning as long as someone wishes for them to return. As revealed by Reve, the fact that many of the newmans on the moon were raised by Mother Trinity makes it difficult for them to let go of their past, although Reve swears to destroy her as many times as needed.
Disney Death: Played strangely straight by her and Dark Falz. One of the post-story quests reveals that as long as newmans like Reve long for the guidance of Mother Trinity, they will keep returning over and over and over again.
Kick the Dog: Does this to Reve. And it's a particularly cruel one at that. While attacking the Arca Plant, Trinity sets Reve on you to stop you from damaging her power supply. You beat him, only for her to toss him away as useless after revealing that she didn't even NEED the Arca Plant at that point. He's utterly devastated.

Turns Red: Mother Trinity has a less colorful but more dramatic transformation into 'Pissy Boss' mode: she smashes her body against the platform you're fighting on, cracking her golden visage and revealing the machinery within.
Utopia Justifies the Means: The whole reason Mother Trinity went to war against the rest of the earth's society; she went into despair from the constant rejection of suggestions and plans she offered to the world leadership on how to repair the planetary environment. Dark Falz manifested in her, corrupting her mind, thus leading her to conclude that something needed to be done ... with force.
Villainous Breakdown: Happens to Mother Trinity for different reasons based on your race. For Humans and Newmans, it essentially comes from being related in some fashion to powerful heroes that fought against her before. For CASTs, the fact that your character is the same badass that fought her in the past, now returned after regaining your combat abilities (meaning her Photon Noise failed to affect you as extensively as it should have), is what causes her to breakdown.

Dark Is Evil: It has a dark-colored body, and is the being Behind Mother Trinity's actions.
God of Evil: He can manifest in the body of someone or something with enough darkness in their heart. That includes Artificial Humans.
Hijacked by Ganon: The fact that this is here should tell veteran Phantasy Star players that Mother Trinity isn't the True Final Boss. That's right; ol' Dark Falz makes its appearance yet again.