Volibar comes from Basque bolu "mill" and ibar "valley".
This demi-god's preferred epithet Valhir is possibly based on unattested Old Norse *Valhyrr "fire of the battle-slain"; valr "battle-slain" is also found in Valhalla "hall of the battle-slain" and Valkyrie "chooser of the battle-slain".
His other epithet the Volibear possibly also contains a variant of valr.
Volibear will gain the cosmetic buff Chronokeeper Hater ("Not even Zilean could keep an armored bear out of the League of Legends") if he and Zilean find themselves on opposing teams (references Tom 'Zileas' Cadwell being against an armored bear champion).
Volibear was tied with Fiddlesticks in a player based vote to determine which champion will receive a Visual Gameplay Update in 2020.
The visual goals for Volibear's update was to deliver his identity as League's storm god without alienating his previous playerbase.
Influences for Volibear include Norse deities, vikings, pagan motifs, storms, lightning, volcanoes and bears.
Volibear's theme is based on a song of worship the ancient Freljordian tribes used to sing in his honor.
His theme was also sung by Einar Selvik, a Norwegian musician who has also composed music for the TV show known as Vikings.
Volibear and Zilean maintain an in game easter egg where Volibear gains 1 bonus armor and Zilean gains 1 ability power if they are on opposing teams.
The narrative goals for Volibear was to reinvigorate the champion with lore that was exciting and more cohesive within the world of Runeterra, and to strengthen and diversify his personality by focusing on the history developed for the champ.
Volibear is the physical form of the Great Spirit of the Bear, as such spirit walkers like Udyr can harness a bit of his primal spirit magic.
Volibear is one of the spirit gods. They are more like manifestations of cultural ideas, given immense power by the belief of their followers and can wax and wane, depending - or disappear for a long, long time.
One of his titles in the main canon, "the Thunder's Roar", was his title in the old canon.
Volibear can be as big or small as he wants due to transcending physicality as a god.
Volibear, the Thunder's Roar
Volibear is the first champion to have lines when killing another champion ("Your time has run out, Chronokeeper" and "I got a special claw for you, Zilean")
Volibear has very little respect for Udyr, who is a shaman and spirit walker of the Winter's Claw that resisted his calling to the spirit walkers of the Ursine clan.
Lissandra lost her sight from confronting Volibear back in the early days of the Freljord. She has since been actively containing his influence by, for example, killing his shamans and those that may join him as well as sabotaging the worship of all old demigods.
Volibear, Ornn, and Anivia are the offspring of the Freljordian demigods, along with other Great Spirit animals such as the "Seal Sister" and the "Iron Boar".
Volibear was close to Ornn but they later became estranged due to their differences in ideologies causing their cataclysmic battle that destroyed the home of Ornn's followers, killing them.
Volibear is on better terms with Anivia because they are both tied to the spirit of the land and want whats best for the Freljord.