A person needs complete control over everything such as a world or a timeline

A portmanteau of carpe diem, a Latin phrase that means “Seize the Day!” and DM, which stands for Direct Messages. This word means seizing the day via DMs.

1. A psychopathological condition characterized by delusional fantasies of wealth, power, or omnipotence.
2. An obsession with grandiose or extravagant things or actions.

a melomaniac who is constantly listening to megalovania (I don't know how to spell it, I haven't played undertale in a long time)

A megalomaniac is a self-centered, power-crazed egomaniac that is obsessed with their goals for conquering cities and countries and world domination, they're rather over-obsessed with power rather than actual conquest. They also often fantasize of greatness, fame, wealth, grandeur, omnipotence predominate and servitude. Because of all the power driving them to becoming critically insane their minds are separated from reality since they also don't care what happens to anything at all as they care about themselves.

Despite having the word maniac in the name of them being a megalomaniac, it does not mean they are always clinically insane.

1)A person obsessed with greed and/or power.
2)A great song from one of the greatest bands in the world; Incubus

1)Someone obsessed with power

2)A kick ass song by incubus