Short answers, pulled from the story.
Freyr is a Norse god associated with kingship, fertility, peace, prosperity, fair weather, and good harvest. He belongs to the Vanir, an older family of gods, and is the son of Njord and the twin brother of Freyja. Snorri Sturluson called him "the most renowned of the Aesir."
Freyr owned the dwarf-made ship Skidbladnir, which always had a favorable wind and could be folded into a pouch when not in use, and the boar Gullinbursti, whose glowing mane lit the way for its owner. He also possessed a sword that could fight on its own, which he gave away as a bride-price for Gerd.
Freyr dies at Ragnarok because he no longer has his self-fighting sword. He gave it to his servant Skirnir in exchange for wooing the giantess Gerd on his behalf. Without the sword, Freyr cannot defeat the fire giant Surtr and is killed in the final battle.
Freyr was regarded as an ancestor of the Swedish royal dynasty known as the Ynglings. His alternate name was Yngvi, and Ynglinga saga describes him as a king who built the great temple at Uppsala, ruled during a period of peace and abundance called the Frode-peace, and was worshipped as "the god of this world" after his death.
According to Adam of Bremen, writing around 1080, Freyr's statue stood in a golden temple at Uppsala alongside statues of Thor and Odin. His image was fashioned with an immense phallus, and a libation was poured to him during marriage ceremonies. The temple was founded, according to Ynglinga saga, when Freyr transferred his taxes, lands, and goods to Uppsala as his chief seat.
A seven-centimeter Viking Age statuette identified as Freyr, showing a seated bearded male with an erect penis, was discovered in 1904 at Rallinge in Sodermanland, Sweden, and is now held at the Swedish Museum of National Antiquities. Small gold foil pieces called gullgubber, found across Scandinavia and dating from the Migration Period into the early Viking Age, frequently depict a man and woman embracing, which scholars have linked to the union of Freyr and Gerd.