What is (in your perspective) your waifu greatest strength and weakness? It could be either something related to her physical abilities (or lack thereof), her personality, her talents, etc.
When it comes to identify Flandre’s greatest strength, a few ideas come to my mind and it gets hard to choose which one I would see as the greatest. Being almost immortal (not ageing and being able to sustain massive body damage) is quite a huge strength. Being able to destroy everything from afar with a simple hand motion is also quite a huge strength (it remains unclear in canon what is the scope of this power… is ‘’everything’’ really EVERYTHING, like planets and starts???).
She as other great strengths, like the ability to fly, a tremendous physical strength, she is extremely good at danmaku, etc. But I feel these strengths are less amazing then the 2 previous ones I mentioned.
When it comes to her greatest weakness, I feel it would be, paradoxically, her incredible ability to easily sustain massively long periods of time with not much stimulation. Flandre is said to very seldom leave the Scarlet Devil Mansion. She even seems to seldom leave her bedroom, claiming it is ‘’comfortable’’. I feel this massive passivity and retreat from the social world is her main weakness, as I feel it leaves her in a constant state of un-accomplishment. I’m also worried about what might be the psychological factors behind this…
Other of her weakness would be the ones typical to vampires, like vulnerability to sunlight and running water, but those vulnerabilities seem pale compared to the one mentioned above.