Who was stronger between Kikyou, Midoriko, or Tsukiyomi? I have my own ideas but Iw ould like opinions. =D

Midoriko definitely, she created the Skikon no Tama. The story line always emphasizes on her as the strongest Miko. Kikyo is strong but could he have done what Midoriko did, possibly not seeing as she was so easily deceived sa pamamagitan ng Naraku, and Tsukiyomi is just a filler character, so the series doesn't define her as she would have been if she was. Hitomiko on the other hand is, and I'd say she's perhaps just a step lesser than Kikyo, the same goes for Tsubaki. Kagome is supposed to be the segundo strongest Miko in the series susunod to Midoriko. Rumiko Takahashi supposedly stated this herself but I don't know if she intended for her to be stronger than Midoriko or an equal but if she possesses the power to purify and rid the world of the Shikon no Tamma then she has to be one or the other.

Ranking of Miko in my opinion is:

1.) Midoriko
2.) Kikyo
3.) Tsuikiyomi

All Mikos:

1.) Midoriko
2.) Kagome
3.) Kikyo
4.) Tsukiyomi (filler)
5.) Hitomiko
6.) Tsubaki

A few further points: Kikyo is stronger than Kagome only in battle, this is because of the extensive training she endured growing up as to become a Miko, and because she obviously has a much deeper understanding of the duty of her profession.
Hitomiko is the same, she is also much madami intelligent and knowledgeable than Kagome giving her an upper edge, but again this of course is due to her extensive training.
And for far as I’m concerned Tsubaki was just an idiot x3

You do mean spiritual power, right? I believe that Midoriko is the strongest, seeing as she created the Jewel. susunod is Kikyo, since she was revered for her spiritual power. I think Tsukiyomi is the least strongest seeing as she was only a minor character.
However, if you are referring to physical strength, then Midoriko would still be strongest, susunod Tsukiyomi, and lastly Kikyo. I believe Midoriko to be the strongest since she battled for seven days (that was how long she fought, right?) before she died. I believe Tsukiyomi to be the segundo strongest since she was supposed to be a female samurai.

Midoriko and Kikyo were the most powerful spiritually. Tsukiyomi was powerful but not as much, I guess.

You guys are saying that medoriko is strongest which I agree. However I'm gonna go with saying the segundo strongest is not tsukyomi but kanade from the 4 war gods movie.