Crossover: Survival of the Fittest

Ruo Song Helin has been afflicted with a curse: unless she finds someone powerful to protect her, she will start coughing up blood at the drop of a hat. She has gotten used to it after coughing for a while, but this nasty curse still needs to be broken. But... who exactly counts as powerful? Note: 1. A crossover with multiple anime worlds. The heroine is adored by everyone. She keeps coughing up blood, but she isn't sick at all. In fact, she's very strong. 2. The male lead is undecided. The heroine spends her academy days looking for someone, then realizing she's picked the wrong person, dumping them and starting over, all while constantly courting disaster. Let's light a candle for her. 3. My writing isn't great, but my imagination runs wild. Please be kind.