noun
Olympic cauldron lighter; final torchbearer
Refers to the person who lights the Olympic cauldron at the opening ceremony, typically the last runner in the torch relay.
最終点火者が聖火台に火をともした。
The Olympic cauldron lighter lit the flame on the cauldron.
今回の最終点火者は元オリンピック選手だ。
This time's final torchbearer is a former Olympian.
聖火ランナー is a general torchbearer in the relay, while 最終点火者 is specifically the last runner who lights the cauldron.
Compound of 最終 (final) + 点火 (ignition) + 者 (person). A modern term coined for the Olympic context.