Edelbert

Edelbert is the het ship between Hubert and Edelgard from the Fire Emblem fandom.

Canon
Edelgard and Hubert have both known each other since they were very young, when Edelgard was four and Huber was six. Hubert was assigned to protect Edelgard as a child, as that is the duty of the von Vestra household. However, Hubert became convinced this was beyond duty due to how strongly he felt about Edelgard and his attachment and protection of Edelgard became something intensely personal.

For the entire pre-timeskip, and within multiple alternate routes, Edelgard and Hubert are the only ones who can share the full extent of their knowledge with one another.

History
When Edelgard was eight and Hubert was ten, Edelgard's Uncle Arundel defected from the kingdom and took Edelgard with him. A ten year old Hubert left the city and fought off soldiers for three days in an attempt to rescue Edelgard, but did not succeed.

Supports
In Hubert's supports with Byleth, he will threaten them because he worries about whether they have Edelgard's best interests at heart.

In Hubert's supports with Ferdinand, he says that Ferdinand is far beneath Edelgard and that he can never hope to even think about being comparable.

In his final A support with Edelgard, Hubert confesses he loves her.

In their final relationship card at the end of the game, it will say they retired peacefully together and that they may never have spoken about the full depths of their love for another.

Verdant Wind
Hubert leaves a letter in case of his and Edelgard's death, which urges Claude to take responsibility for the sacrifices Edelgard has made in an attempt to create a better world.

Azure Moon
Hubert is the one most concerned with Edelgard's transformation choice during the final battle and worries about the reversability of it.

Quotes

 * Hubert: "The sensation of loss that overcame me on that day defies all description. It was as horrific as if I'd lost all my limbs. I left the city in a mad rush to rescue you. My father sent soldiers to capture me. I fought them off for three days, but they did finally manage it. Of course, I was only ten. I never would've reached Fhirdiad."
 * Hubert: "I would make any sacrifice to support Lady Edelgard. It's a shame you've never experienced such devotion."