yeah I have luci and I use him....uhh...not infrequently? I like to think I kinda do 33% luci, 33% haku, and 33% valk/hera-ur. It may appear to be luci more than it is though cuz runs involving him last longer for obvious reasons...Actually I frequently goto bed doing a run with him until I get tired, put my phone down, sleep, and finish up the run when I'm ont he bus or something.
Needless to say I find him kinda boring to use too, but fact is he's almost always the best choice for anything that CAN be done with him because there's so little luck involved, I feel like anything I can do with him, I WILL do with him, without fail or stones or anything. With other leads, there's always a chance of a death due to bad orbs. Or even one little finger slippage during full-health can result in death, with luci, you can eff up a turn and no biggie, just focus on healing the next turn and you're good.
So basically, I use him for dungeons that are really hard that he can handle that I only really wanna do once and then bail on, though I do like him for hera too (slow yes, but I have gravities now, and charging luci+gravity doesn't take that long when you're unconcerned about survival, just mash 1 chain combos to speed up the charging time and do a bigger combo on turns 3-4 for healing time, I probably can do hera with haku/valk but they're long so chances of a fatal eff up or bad luck orb thing are quite high).
