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.
Topalov definitely. See his games at Gibraltar especially against lower rated opposition.
I have to tell you honestly, Michael Adams is the top in that. Lots of his 2700-level games are absolute craziness.