Basically everyone gets Battle Spirit (
Overwhelming Aura that causes
Fear Manipulation and
Paralysis, and even internal bleeding).
The databook says that Rengoku's powerful Battle Spirit overwhelms others, so this is the same as the aura Akaza sees and the overwhelming fear pressure characters keep mentioning.
Basically everyone gets Extrasensory Perception (Able to sense the presence of others and malicious intent). This is supported by Enmu being sneaky because Demon Slayers might sense his malevolence even when they are asleep, Lower Moons talking about sensing Muzan's aura, Muichiro sensing Nezuko's presence, and Muzan sensing the presence of Pillars.
All Demon Slayers get Resistance to: Poison and Biological Manipulation. Supported by Zenitsu resisting the Spider Brother's poison, Inosuke and Tengen resisting Gyutaro's poison, and the Pillar's resisting Muzan's blood (Demon Slayer Mark boosts this further). Also, normal people can transform into demons within seconds, but Breath users require a few days.
All Demon Slayers get Resistance to: Acid Manipulation, since a
fodder chad like Murata was fine after it melted his durable clothes.
Some Demon Slayers (Gyomei, Sanemi, Zenitsu, Inosuke, Kanao) get Invisibility with Yushiro's talisman, since they used it before which makes the presence concealment talisman optional equipment.
Genya gets Stealth since he is confident enough to attempt sneak attacking Upper Moons. It is also shown that Daki is good at hiding her presence, and Kyojuro said the same about the demon in his dream.
Genya also gets Statistical Amplification, since he gets a power boost after reciting a prayer, which he later explains to be his Repetitive Action trigger.
The most skilled characters gets Instinctive Reaction. Scaling from Kyojuro's danger-sense feat, Mitsuri, and Tanjiro. Also, Zenitsu I guess.
Akaza gets Sound Manipulation for hurting Tanjiro's ear with his scream when Tanjiro was a considerable distance away.
Kokushibou gets Danmaku for obvious reasons.
Upgrading Muzan's regeneration to Low-High, as we've seen him form his scarred limbs from just his blood (cool foreshadowing), there is also the statement that Yoriichi's sword created wounds that continue to burn him on a cellular level.
Muzan gets Power Absorption and Soul Manipulation and Memory Manipulation linked to his Absorption, as he was going to use this to gain Nezuko's sun immunity, and he was able to talk with Tamayo's ghost before reading her memories.
The Curse Manipulation/Telepathy/Power Bestowal for Muzan could be formatted in a better and more concise manner.
Muzan gets Air Manipulation, since he is able to create small whirlwinds that pull his opponents with his tentacle mouths.