Guardian looks alright, but the LP requirement needs to be more specific than just "lower than your opponent's". Other than that, good stuff.
How much LP are we doing, 4000 or 8000? Because that'll change the way I change the card. I'm either thinking "X amount less than the opponent's LP" or just "2000 or less LP".
Personality: Elise is a patient, caring person, though snappy at times. She easily loses herself in competition and will never give less than her all once she gets fired up. She's occasionally tried to give more than her all, resulting in risky situations and often muscle-aches that would last days after. She enjoys repairing things and playing Yu-Gi-Oh!, though she isn't quite sure what to make of her guardian.
Bio: Elise was born into a dirt-poor family. She started working when she was still relatively young, taking small jobs to get by. One day, she encounterd a man, approximately in his 30s. The man gave her a deck of cards and a stack of cash. When she went home to show her parents, they scolded her for "stealing" the money. Clearly they didn't believe in random strangers handing out money. That was, until the man himself (who had seemed like a god to the young Elise) came over a few days later and explained what had happened. It seemed as if the man had also explained why, but even today these reasons are unknown to Elise.
Since her encounter she has dueled a lot, including games with an ante as well as some underground tournaments, the money of which she used to start a small business for a more consistent income. Running a small shop for repairing motorbikes, bicycles and the like. She'd still duel whenever she had the chance, but not as often as before, partially due to her not participating in underground tournaments anymore.
One night an email came in, which on it's own wasn't anything unusual. The contents were a surprise to her, though. Normally she'd receive emails requesting repairs or planning for said repairs, and occasionally a stubborn email about some underground tournament. This email, while she'd almost dismissed it as one, turned out to be no underground tournament at all. In fact, it was quite the opposite. An official tournament with an astonishing price of 1 million. Sure, she got by nowadays, but 1 million was simply to much to pass one. Determined to play, she left for the tournament. Determined to win, she planned to leave with the prize.
Deck: Speedroids
SUMMONING CONDITION When your LP is 1000 or less, tribute monsters until you have 1 left; guardian summon this card.
4k is a lot more narratively interesting. Duels won't last as long and are a lot tighter, making you be more conservative with both LP and maybe a little more risky with your plays. Both players are on a timer, which leads to tension. Longer duels are just not as interesting to write out, as I've witnessed first hand in my RP. Some of the most fun duels I've had barely scraped the turn 10 mark, which is counting each player's turn as 1 (so 5 turns for both players). This is also why the anime does it: Not only does it save time, you can also chop off LP in a more interesting way rather than just hurling 3 chunks of 2.5k and then letting the protag reversal it by buffing their monster up to 20k ATK or something ridiculous.