Developing various cartoon superpowers is mostly used in the context of being denounced as being of inferior value compared to that tradition's idea of spiritual salvation. So I am not sure if that can be taken as promoting asceticism.

Leaving mythology aside, different spiritual traditions strive towards different goals.

Sikhism rejects outward asceticism... "Asceticism doesn't lie in the earring, nor in the shaven head, nor blowing a conch. Asceticism lies in remaining pure amidst impurities."

Buddhism advocates a middle way, and is against too much asceticism as well as too much hedonism and in mahayana a vow working to benefit others... http://en.wikipedia.org/wiki/Bodhisattva_vow http://en.wikipedia.org/wiki/Middle_way

Hinduism is a very mixed bag. A one of the most popular ideals involves working towards outcome in a non-attached way... http://en.wikipedia.org/wiki/Karma_yoga

Jainism probably has the most ascetic spiritual ideal among the indian traditions.