I would like to start right in the beginning, and assist L secretly and tell him everything I know using my prior knowledge of the series. Maybe I would stop Light from becoming Kira in the first place, because Light seems pretty cool without the Death Note, and L is just awesome and did in no way deserve to die. I miss L :(
I would be confused if i were sucked into the death note universe... I would be really happy as soon as i met L though!! Teehee......The beginning, I would help L....He is the best after all!!!!!!!!!!!!!!!
Maybe midway after Light meeting L (actually, maybe when Light loses his memory of the Death Note) so I can explain everything to L without risking my name getting exposed! Never gonna tell anyone my name too xD!
Definitely going to be on L's side, but I'll still try to stop Light from further using the death note from the start. but hardly think he would listen.