Lori - Definitely trying to make her victim's/victims' mind get distract by her charms and starting the pranks she creates.
Leni - None (Cuz she isn't understand that word and its meaning).
Luna - Locked the victim(s) in a soundproof room and turned on the worst song ever to torture them in a bad way.
Luan - Put the automanic springs under the banana cream pies in victim's/victims' locker. When they open it, the pies gonna smash in their face.
Lynn Jr - None (cuz she has no reasons to do one of those), but she would sit and enjoy the matches or join her siblings if they're doing it on the victim(s) she dislikes.
Lincoln - Challenging his victim(s) in a video game, no matter how victim(s) being determinated, Lincoln always wins because he knows the tricks to win the gameplay. During gameplay, he constantly pushes his victim(s) into a lot of troublesome, traps, prank settings, and more blablablah... that he messes up.
Lucy - Instead of pop out of nowhere like she usually does. She gonna tie victim(s) up and shows her eyes behind the bangs. Or tell about the grim reapers related stories.
Lana and Lola - Surprise! These two corperate together and team against you. Normally, Lana will be the one who starts everything by do something wrong at Lola, and she gonna get angry by Lana's behaviours. Then, jump to try to beat the hell up out of her twin, but Lana pulls herself near the victim(s) then Lola's unstable aggression would mistake and change her target to others, and it always ends with this catchphrase "I hope like the taste of floor/(ground/my anger)!!!". And if some situations that Lana and Lola swap roles, all the steps are the same, except Lana's catchphrase is "Take down! Two points! Your turn, pal(s)!"
Lisa - Well ok, her instinct kind of like experiment thing, so there's nothing here. I mean I didn't count her because it's very abusive more than just the prank circumstance.
Lily - Stealing, buying old expired paint, which are sold by Flip, plus a little help from Nacho and his skunk girlfriend. She sets the traps in top of doors and clock counting backwards until victim(s) go(es) through that ways.