I've just started to main Lucas, but since the only competitive player I know only comes around five times a year or so, I'm not sure how effective my strategy would be in a tourney. I fight lvl9s a lot to practice up. Mostly I fight a ground game, tossing out Ftilt everywhere and PKF to chase to the edge. Computers are really easy to chase with PKT off the edge, but I think most real players would airdodge or something. If they get too close I toss out a jab combo before they can grab, since it has a small hitbox behind Lucas. Lvl9s tend to constantly roll back and forth past me, so sometimes Fltilt, Dtilt, or Dsmash can knock them out of it. Mostly I just play whackamole with their perfect shields until a Ftilt connects, then I follow up with some PKF spam and finish with a thunder chase. If I miss, then I direct it at the stage to end the move early, to avoid the punishing end lag. SH Nair is always nice if you're fighting someone too fast to PKF right, since the long hitbox protects you. Fair has a little more priority in my experience, so if I'm sure I'll hit it's sometimes better to use it since it sets up a Dtilt/Ftilt nicely. Haven't played MK with this yet so I'm not sure what to do with that.