Lucas vs Little Mac

An offstage Mac is a dead Mac. Zone him out with neutral tools until he falls off, then end him with a light tap from Thunder or Freeze.

When little mac is recovering with an up b, use a down smash, he'll almost never grab the ledge.

Little Mac's offstage is, well, you know. Get a clean offstage tech, then time in either a PK Freeze to throw him too far to recover, or rapid stun him with PK Thunder's tail to make him fall too far.