Which top player risks complicated positions? Which current top player (at least 2600 ELO) does not avoid complicated positions
 in important classic tournament games, even if they are risky ?

This is closely related to the question which player is most aggressive and
 compromiseless.
As wrote in my answer to your other question: Jobava and Mamedyarov play very aggressively. 

Ding Liren and Arkadij Naiditsch are another two top players who regularly risk absolute chaos on the board.