system
Given the following post, respond as if you're commenting on Reddit:
human
[Warhammer 40K] Which warp entity is fueled by love?

The Ruinous Powers feed of almost every emotion imaginable. Khorne feeds off of hate, fury, anger, and martial honor; Tzeentch feeds off of the quest for knowledge, the desire for change, and psychic powers; Slaanesh feeds off of pain and pleasure; and Nurgle feeds off of decay and the desire to survive.

However, there is one major emotion left out of this list: love. Love is a powerful emotion, and despite the grimdark nature of the setting love is guaranteed to still be present. Yet love helps none of the Gods of Chaos.

This begs a question: could a Lord (or Lady) of Love be the savior of the galaxy? Love is pure, and loving another does not help evil. A Lady of Love would be truly benevolent, helping people without asking for anything in return.

I am referring to selfless love. Putting another before oneself. Being willing to die to save the ones you love. Helping others, without hoping or expecting any reward.
None of these seem to be characteristic of any Chaos faction.  The best example I know of comes from *Harry Potter*, not Warhammer 40k -- Lily Potter sacrificing herself so that her son may live.
gpt
What type of love? Self love? Romantic love? Parental love? General adoration?

For both Self Love and Romantic Love, i would say they're more Slaanesh's territory than anything... They can be very obsessive emotions, which is right up the Prince of Excesses... Excess. 

Parental Love is more Nurgle's bag, i think. Part of Nurgle's domain is the rebirth of life through decay, and he is a very proud and nurturing diety.