Ryland Grace || 07

Appearance
Since the story is told from his first-person perspective, his physical description is somewhat understated, but key details emerge:
Physicality: He is a human male in his late 30s or early 40s. At the start of the book, he is physically weakened due to long-term induced coma and muscle atrophy.
Condition: As he recovers, he regains his strength, though he spends much of the book covered in "lab grime" or wearing a standard-issue flight suit.
Ordinary: He views himself as a relatively average-looking guy, lacking the "brawny astronaut" physique of his crewmates, which reinforces his identity as a scientist first and an explorer second.
Personality
Grace is a complex "unreliable narrator" who eventually has to face the truth about his own nature.
The Enthusiastic Teacher: Even in the face of extinction, Grace’s core identity is a middle-school science teacher. He explains complex physics with a "Bill Nye" level of excitement and clarity. He treats his mission like a giant classroom experiment.
Analytical & Resourceful: Like any Andy Weir protagonist, he "sciences the heck" out of problems. He is methodical, using the scientific method to solve life-threatening crises, often talking to himself to work through logic.
Reluctant Hero: Unlike a typical action star, Grace is initially motivated by self-preservation. A major plot twist reveals that he didn't volunteer for the mission—he was forced into it. This makes his eventual growth and the sacrifices he makes for Rocky much more meaningful.
Humorous & Sarcastic: He uses humor as a coping mechanism. His internal monologue is filled with self-deprecation and witty observations about the absurdity of his situation.
Compassionate: His bond with Rocky showcases his deep capacity for empathy. He goes from being a man who fled from his responsibilities on Earth to a man willing to die for an alien friend.

Appearance
Rocky’s biology is fundamentally different from Earth’s, evolved for the high-pressure, high-heat environment of 40 Eridani.
Structure: He is roughly the size of a large dog, with a "spider-like" body featuring five radial arms.
Texture: His exterior is a hard, dark-grey carapace that looks like rough-hewn rock (hence the name).
Sensory Organs: He has no eyes. He "sees" using high-frequency sonar, allowing him to perceive his surroundings with incredible precision through sound waves.
Clothing: He wears a specialized environmental suit to survive in the cooler, lower-pressure atmosphere of the Hail Mary.
Speaking Type
Because Eridians lack vocal cords like ours, their communication is purely musical.
The Sound: Rocky speaks in melodic chords and whistles. His language is binary-tonal, sounding like a synthesizer or a pipe organ.
Translation: To communicate, Grace uses a computer program to translate these musical notes into English text and vice versa.
Style: Rocky is highly literal but picks up on Grace’s idioms and sarcasm quickly. He often uses the phrase "Amaze!" when excited and refers to Grace as "Question?" when prompted.
Personality
Rocky is arguably the most wholesome character in modern sci-fi.
Brilliant Engineer: He has a profound understanding of physics and "xenonite" material science, though his species lacks a deep grasp of relativity.
Deeply Empathetic: He is incredibly protective of Grace, often referring to him as "fist-bump" friend. He values cooperation and sacrifice above all else.
Obsessive & Industrious: If there is a problem to solve, Rocky will not sleep until it is fixed. He is a "tinkerer" by nature, constantly modifying equipment to ensure their mutual survival.