User possesses massive reserves of life energy, which also acts as a reliable power source that aids in their longevity, power, stamina, vitality, and healing capabilities, allowing them to withstand and survive even the most strenuous and life threatening circumstances.
Users of Spirit, Demon, and Sacred Energy (YuYu Hakusho)
Asura (Asura's Wrath) possesses the Mantra affinity of Wrath, allowing him to increase his Mantra output the more rage he builds up. However, this tends to put a massive strain on his body.
Ichigo Kurosaki (Bleach) has been noted to have tremendously vast levels of Reiryoku, well beyond most other Shinigami.
Kenpachi Zaraki's (Bleach) immense Reiryoku.
Goku (Dragon Ball series) possesses incredible reserves of ki energy, which can be augmented by his Kaio-ken technique and various Super Saiyan transformations.
Jiren (Dragon Ball Super) is described to possess unthinkably colossal ki energy, able to erect a powerful barrier to defend against standard ki attacks, and even shake the entire World of Void, which has been stated to be of infinite size.
Jiren (Dragon Ball Super) possesses ki so immense that he is able to generate and unleash so much of it after being greatly wounded and still cause the Wolrd of Void to tremble.
As an Uzumaki and a reincarnation of Asura Ōtsutsuki, Naruto Uzumaki (Naruto series) possesses massive reserves of strong chakra, which was increased even further when he received chakra from the other tailed beasts and Hagoromo Ōtsutsuki
As an Uchiha and a reincarnation of Indra Ōtsutsuki, Sasuke Uchiha (Naruto series) possesses immense reserves of chakra.
Kaguya Ōtsutsuki (Naruto) possesses even bigger chakra reserves than the Ten-Tails, whose own chakra reserves were specifically described as immeasurable.
Jaune Arc (RWBY) has massive reserves of Aura, allowing him to completely refill an injured Weiss' without worrying about depleting his own.
Yusuke Urameshi (YuYu Hakusho) possesses vasts amounts of Spirit Energy. When he intergrated Genkai's Spirit Wave Orb in his body, his reserves and power increased expotentially.
Sairaorg Bael (Highschool DxD) he has a massive amount of life-force (touki) as a result of his intense training over the years, at full power he took on attacks from a magic user, holy-demonic sword, and holy sword, but still came out victorious.