Hello, this is a summary of the consequences of the set of choice’ branches that caught my attention with the intent to serve as a reference to evaluate and opinate, and in the case of the author, verify if the result fit their intent; beyond that, there’s a set of suggestions below you may take, refine, or skip.
Cold: +2 Willpower, -2 Charisma
Shy: +2 Charm, -2 Leadership
Jovial: +2 Charisma, -2 Perception
Quarterback (+4 Physique): Charm (+3 Charm) or Leader (+3 Leadership) = 7
Top gun (+5 Charisma): Hot (+3 Charm) or Rally (+4 Leadership) = 8 ~ 9
Smart (+4 Intellect): Detail (+3 Perception) or President (+4 Leadership) or Ego (+5 Willpower) = 7 ~ 9
Average (+1 Leadership, +2 Physique, +2 Charisma, +2 Charm, +2 Intellect, +1 Willpower, +1 Perception) = 11
Cannon fodder (-1 Leadership, +1 Physique, -3 Charisma, -2 Charm, +2 Perception) = -3
In regards to how you use your powers:
Hurting Momo or not (relationship change)
Saving girl or not (relationship and health change)
Scream (+4 Exp) or Use power (+6 Exp, Murphy dies) or Use necromancy (+4 Exp, -1 Core cost, Murphy servant) - footnote: Poor Furchick 
In regards to how you treat others:
Be approachable to Olivia (+1 Charisma, + friendship) or not
Get a full explanation (+1 Intellect) or not
Joana: “but before anything, I’ve gotta ask. What’s your special ability?”
The following answers don’t seem to have differing consequences besides flavor (in this case, you may want to just write one answer and change the way it’s worded to fit a given personality choice; alternatively, you may want to consider the psychological aspects of MC that you’d keep separated from their personality choice, like emotions and motives, to differentiate the plot consequences of an answer branch, e.g., is MC taunting, lashing out, tempting, soothing, or gathering favor/information from a character? Does MC want to stand out or lay under the radar? Does the MC, if not neutral, like or dislike a character? Does it show it or hide it? etc. In this case, if nothing else, MC may want to downplay their power so as not to alert Joana or may want to be seen as useful as possible so as not to be seen as replaceable.
If you go down the route of delegating flavor to the personality choice you may want to expand on it, if I were to suggest you some archetypes, I would share these simplifications (they may need refinement, I’ll leave it to you):
Melancholic (Contemplative and hypercritical person, is your shy personality)
Phlegmatic (Contemplative and easygoing person, is kind of like Shikamaru Nara from Naruto)
Sanguine (Interactive and easygoing person, is your jovial personality)
Choleric (Interactive and hypercritical person, is your cold personality)
And I second the notion that you may want to define what every stat entails beyond their title, so we can make sense more accurately of what stat modifier should go to what action, personality, or background. As in now I’m having trouble figuring out why a shy personality would have more charm than another.
Thank you~