Who is the Strongest Characters of Touhou? (in your opinion)

i would put Momiji Tier A but she is the most weakest Tengu we know
Akyuu describes tengu as one of the strongest species, both in physical and magical abilities. While nothing about Momiji herself has especially come to light, she is likely to possess some of those traits, such as their (almost) unmatched speed
approximately 3,927 kilometres, or 2,440 miles, she also has a superior sense of smell, that combined with her ability makes her able to detect any intruder in an instant

That's not bad but for some other characters she is nothing, Momiji vs Aya or Hatate, Momiji get destroyed

Seija will reverse the world and destroy Hecatia