Hello!
I'm thinking of picking up Lucas, but have a few questions.
What is his play style and is he linear now that his brawl tech is gone?
I'd describe Lucas's play style as a mix between mid range zoning and quick CQC.
In the neutral, you're going to want to poke at your opponent from a safe distance with short hop PK Fire and zair. When your opponent gets too close, take advantage of the good frame data on Lucas's grounded normals to compete with your opponent in footsies. Lucas's jab, for example, is frame 2 and has a hitbox that covers his entire body, making it good for catching rolls. His frame 3 down tilt and frame 4 up tilt can also put your opponent in a bad position.
Lucas's kit is geared towards nullifying projectiles. PK Fire and zair beat out anything that isn't transcendent. Forward smash is a serviceable reflector. PSI Magnet can be cancelled upon absorbing a projectile with a jump, spot dodge, or back roll, making it virtually impossible to punish. All this forces most characters to approach Lucas, and that lets you control the pace of the match.
Magnet can also stall your momentum, making for a good mix up when you're in a disadvantaged state.
As for combos:
Zair combos into jab, tilts, and grab.
Down throw combos into every aerial. Dthrow > nair > nair > uair works at certain percents and is a personal favorite of mine.
Short hop nair combos into up tilt and aerials. Nair > dair near the ledge is good for setting up edge guards.
Down tilt combos into jab and tilts at low percents and grab at high percents. Down tilt > up/back throw is a useful kill confirm.
I don't have any experience with Brawl Lucas, so I don't know how comparatively linear is might be.
If you have any questions, don't hesitate to ask.