Quick answers
Who counters Lux in Wild Rift?
In the matchup data documented in Rift Lab, these are the harder matchups for Lux: Zed (Mid), Fizz (Mid), Yasuo (Mid), Nautilus (Support), Blitzcrank (Support), Pyke (Support), Annie (Support), Kassadin (Mid). This is a documented matchup list, not a win rate: TheNexus does not publish win-rate or pick-rate figures it cannot source.
How do you play against Lux in Wild Rift?
Riot's ability text for Lux contains none of the crowd-control, dash, shield or healing wording we match on. Read the ability descriptions on this page before the first trade.
What is the best build for Lux in Wild Rift?
The Nexus-reviewed core build for Lux, in purchase order: Luden's Echo then Rabadon's Deathcap then Infinity Orb then Boots of Mana. Runes: Arcane Comet, Manaflow Band, Transcendence, Scorch, Bone Plating. Situational swaps: against enemy crowd control: Banshee's Veil; against enemy shields: Oceanid's Trident. This is a reviewed snapshot (patch 7.2b), not a build ranked by win rate.
Which lane and role does Lux play in Wild Rift?
Lux is a Mage and Support by Riot's classification and is played in Support. Riot rates the difficulty Low. On our tier-list snapshot (patch 7.2b) it shows B tier from its external source, which is a snapshot letter and not a TheNexus win rate.
Every answer here is built from Rift Lab data and Riot's own ability text. Where the data is missing we say so instead of guessing.