Sans: Teleportation, Gaster Blasters, Gravity Control, Dodge

Papyrus: Bone Attacks, Blue attack, Healing

Undyne: Spears, Weapon summoning, battle techniques, actual fighting styles, blocking

Alphys: Science, Learn more about soul traits/abilities, bringing the monster kind back to life (partially)

Toriel: Most powerful Healing, fire,

Asgore: More powerful fire, Orange and Blue attacks

Flowey: Bullet hell, changing abilities (friendliness pellets/Satan Seeds)

Grillby: Most powerful fire magic, minor healing

Muffet: Keeping to 3 places, staying ahead, string magic

Frisk: MERCY, ACTS, dodging, healing,

Asriel: GOD OF HYPERDEATH, Gaster blasters, star saber, stars blazing, star blaster, shock breaker

Mettaton: Explosions, movements, dramatic flares,

Gaster: Void travel, teleportation, AU walking, summoning hands, medium healing

???: Harnessing HATE, BUT IT REFUSED, Possession, raising LV, taking human souls