General info on Minoru's pact marks:

1. Pact marks look like tattoos on the skin. However, when Minoru touches them with care, the brothers become extremely happy, although some of them keep composure if they are in public (Ex: Lucifer)

2. All pact marks are black in color, with the exception of the pact mark with Mammon.

3. The pact marks are always visible to Minoru and the brothers, although the brothers can hide them from the eyes of normal people and lesser demons. People with high spiritual power can still see the pact marks, despite the invisibility spell.

4. All pacts bring benefits and downsizes. The downsizes involve the respective sins of the brothers. The practice of Seven Virtues can lessen the effect of the downsizes.

Ex: practice of Humility can lessen the prideful thoughts and behaviors brought by the pact with Lucifer.

5. When Minoru calls upon or summon the brothers, the marks emanate light in respective sins' colors. However, if the situation is dire and the brothers have to use more of their powers, the marks emanate fire in respective sins' colors, instead of light. The fire doesn't burn or harm Minoru but makes his skin a little bit red. However, the fire does burn anyone else who dares to touch the marks.

Ex: Pact mark with Lucifer emanate blue light and blue fire.

6. If anyone dares to stare too long at the "tattoos", they will see the brothers' eyes looking back at them, sending them a chill up their spine.

7. Once a pact mark is marked on the skin, it can't be moved elsewhere

Ex: If a pact mark is on the right arm, it stays there permanently and neither the demon nor the human can move it elsewhere on the body.

Minoru's pact marks with each brother: (the order follows the order of making pact in ss1 of the game)

MAMMON

- The only pact mark that is white in color, instead of black.

- Location: on Minoru's inner upper left arm. At the time of the making the pact, Mammon wasn't happy about making a pact with a puny human so he chose to place it in a hard-to-see place on Minoru's body, a decision which he came to regret later, but nothing could be change.

- The pact emanates yellow light whenever Minoru sees something valuable, such as money, pearl necklaces, ancient artifacts, etc.

- When Minoru caresses the mark, Mammon feels extreme happiness and his face shows it, though he denies if his brothers point it out.

- It's still debatable whether Mammon gets luckier when Minoru caresses the mark or not.

- Benefits

Ability to evaluate something accurately, recognize what's fake and what's really valuable (including counterfeit vs real money)

Better at math, especially money calculation

Ability to understand the language of the birds, especially corvid

Better luck at gambling

Good business plan thinking

- Downsizes

Gambling addiction

Tempted to steal or rob, especially if the thing's valuable and Minoru doesn't have it or need it (combines with the Envy downsize from Levi's pact).

Practice of Charity or Generosity lessens the downsizes.

LEVIATHAN

- Location: on Minoru's right calf. Originally, same reason with Mammon's. But Levi got better ending, since at least he gets to feel the mark when his leg intertwine with Minoru when they are playing games.

- The pact mark emanates orange light when Minoru enters an aquarium or come into contact with aquatic creatures. The same happens when Minoru likes or gets excited because of some games or anime, or his beloved Tokusatsu shows.

- When Minoru caresses the mark, Levi feels extreme happiness to the point of stop watching his favorite anime / playing his favorite game for as long as Minoru still caresses the mark.

- Benefits

Minoru can swim better and holds his breathe under the water (up to 1 hour).

Ability to understand the language of aquatic creatures, especially Henry 2.0 and Lotan.

Levi's pact mark on Minoru scares ferocious sea creatures away when Minoru dives into the water, including the most ferocious sharks.

Minoru can be very good at gaming, with the condition of practicing to play that specific game for a few days.

- Downsizes

Inferiority complex (can be lessened by Pride from Lucifer's pact)

Gaming and anime addiction

Minoru is tempted to shut himself inside his room.

If Minoru sees someone else has something he doesn't have, he becomes very envious (Greed from Mammon's pact will add the desire to possess that thing and temptation to steal).

If Minoru summons other brothers/using other brothers' powers, the mark will emanates strong orange light, as Levi becomes envious of his brothers.

Minoru's Big Bad Chūnibyō becomes worse.

Practice of Kindness lessens the downsizes.

BEELZEBUB

- Location: on Minoru's back. Beel actually does not enjoy being all gluttonous, as it makes him sad with hunger all the time and it's the source of misery for him and his brothers many times. Which was why Beel placed the mark far from the belly.

- The pact mark emanates red light when Minoru enjoys his food.

- When Minoru is full, Beel feels that a part of his hunger is satisfied. When Minoru burps, Beel burps too.

- Benefits

Minoru gains more physical strength.

Minoru can easily gain sculpted body, with the condition of working out for 8-10 days, combined with delicious & healthy food. (NO Solomon's cooking, or the progress will be ruined and Minoru has to start all over again).

Minoru can consume much more food.

Minoru's stomach can digest many things that human stomach normally can't. For ex: gum.

Minoru can scent the food from pretty far away.

Minoru can scent whether poison is in the food/drink or not.

- Downsizes

Minoru can easily falls into gluttonous behavior.

Practice of Temperance lessens the downsizes. Sharing food with others, especially loved ones and less fortunate people, helps too.

ASMODEUS

- Location: on Minoru's left hip. Well, Asmo loves to grab others' hips.

- The pact mark emanates pink light when Minoru feels lustful desires or when he reads/watches R18 content.

- Benefits

Minoru gains the ability to charm people and mildly influence their opinion on him (people with high spiritual power are immune with this charm).

Minoru becomes better at reading people and determining their desires.

If Minoru puts his heart into it, he can influence beauty standards of the whole country.

Minoru becomes a good make-up artist, he's able to create life-like makeup if he practices for a short time.

Appreciation of beauty of many kinds.

- Downsizes

Minoru easily has filthy thoughts.

Charms can lead to many dangers, including stalkers and other people with dark intentions.

Minoru easily falls into insecurities, about his body, his handsomeness, or performance in bed, etc.

Practice of Chastity or Purity lessens the downsizes.

SATAN

- Location: on the back of Minoru's right hand. Satan loves to look at it when Minoru reading a book.

- The pact emanates green light whenever Minoru is angry, especially at unfair or unjust actions.

- However, when Minoru is calm, Satan becomes extremely happy to the point that he may purr.

- Benefits

Love of book, love of knowledge

Minoru can easily gain the affection of cats. Even ferocious cats will warm up to him within a week. The same applies to big cat like lions, tigers, cheetahs, etc.

Minoru also becomes better at analyzing. He could become a good detective, with the condition of practicing and reading detective stories, like Sherlock Holmes.

- Downsizes

Anger issues

Minoru gains immense strength when he's angry, which results in destruction.

Minoru occasionally gets into rebellious phrase after arguments with Lucifer, 1 of the most distinct signs is that he wears only the right sleeve of his cloak or blazer, similar to Satan.

Practice of Patience lessens the downsizes.

BELPHEGOR

- Location: on the back of Minoru's neck. It's above Beel's mark, and more importantly, it serves to remind Belphie of forgiveness and trust after what happened in Lesson 16.

- The pact emanates purple light whenever Minoru has sweet dreams in his sleep.

- Benefits

Minoru feels more rested and energized after sleeps and naps.

Minoru can review information and lessons in his sleep though dreams. (Because Belphie gets good grades at RAD despite sleeping all the time, so Belphie probably studies in his sleep, right?)

Minoru can remember all of his dreams after making pact with Belphie.

Appreciation of the beauty and meanings of stars and constellations.

- Downsizes

Minoru gets more tired after doing some important tasks.

Minoru needs more sleep than usual.

Minoru gets lazy habits. Why should I go outside if I can lie in the comfy bed all day? or Let's finish eating before the others, so that I'll not be the one washing the dishes.

Minoru also remembers nightmares.

Practice of Diligence lessens the downsizes.

LUCIFER

- Location: on the back of Minoru's left ear. Lucifer wants to protect his reputation and image, and given how pacts work, Lucifer doesn't want other demons to easily see it.

- The pact emanates blue light whenever Minoru takes pride in some works he accomplished.

- If Minoru gets cocky, Lucifer will know right away.

- Benefits

Minoru is better at chess and politics.

Minoru gains a boost in confidence whenever he touches the mark.

Minoru behaves more elegantly and gracefully.

Minoru gains holier-than-thou aura. (According to Thirteen in Lovely Lucifer? Devilgram, Lucifer always has holier-than-thou aura).

Minoru can use his left hand more proficiently (as Lucifer is ambidextrous), although not to the point of being ambidextrous.

- Downsizes

Arrogance

Minoru becomes more sadistic, which boosts his Big Bad Chūnibyō.

Overestimate oneself, which causes Minoru's Big Bad Chūnibyō to be worse.

Practice of Humility lessens the downsizes. Inferiority complex from Levi's pact can NOT help as Lucifer is much stronger than Levi.