Bane
Pretty simple actually. I'd go with the
Bane Of The Demon storyline in which Bane is highly intelligent. In "Bane of the Demon", Ra's al Ghul says that Bane "has a mind equal to the greatest he has known." In prison, he taught himself various scientific disciplines equal to the level of understanding of leading experts in those fields. He knows six active languages and at least two additional arcane and dead ones, those mentioned are Spanish, English, Urdu, Farsi, and Latin. The "Bane of the Demon" storyline reveals that he has a photographic memory. Within one year, he is able to deduce Batman's secret identity. He is also highly devious and a superb strategist and tactician. In prison, Bane also invented his own form of calisthenics, meditation, and a unique fighting style. Usage of Venom enhances his physical abilities and healing process to superhuman levels.