Once the first king of Askr, Líf form an alliance with the Divine Dragon Askr, and with the dragon's blood he gained the ability to open gates to other worlds. He is also the founder of the Aether Keep. According to Reyson in Chapter 3, Líf has the power to bound Heroes to contracts.
In Book III, Chapter 1, Líf is resurrected as a General of Hel who attacks the Order of Heroes during Hel's invasion of Askr, set on destroying the world. After his defeat, he vanishes, as his descendant Alfonse explains to his sister Sharena that Líf is their ancestor. Líf appears in Chapter 4 for a rematch before Hel arrives to take Alfonse's life, but he does not say anything at all.
In Chapter 6, Líf appears before Alfonse a third time upon entering the realm of the dead, saying that death cannot be defied, and the living will never understand until they die. Afterwards, he retreats to meet up with Thrasir. The two fight against the Order of Heroes as a team, and flee they are defeated once again. Líf opens up a portal to another world for him and Thrasir to escape to, while the Askrans and the Order of Heroes follow them in pursuit.
Líf can be described as a man of few words, only speaking on rare occasions, such as his first appearance. Having been resurrected by Hel, he has turned into a cold-blooded killer set on destroying all worlds.
- Lethal Swordsman
- General of the realm of the dead. At his queen's command, this dark swordsman fights in hopes that all the living will join the ranks of the dead.
Líf is illustrated in the trading card game Fire Emblem Cipher with the following cards:
- Líf's artwork shows him wielding Sökkvabekkr.
- Líf shares his English voice actor, Edward Bosco, with Gustav, Luke, and Klein.