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Yes, I didn’t mention the Bm since it is exactly the same shape as the C#m only 2 frets below. The index finger on the A string forms the B, the ring the F# and the pinky makes another B.
This question: “Or would that be a B power chord; how to make it minor?”
My reply: I think you are confusing sharp and flat notes with major and minor chords. What makes a chord minor is the flattening of one of the notes that would normally make up that chord. So your question is actually a good one, because what makes the barre chord minor is the minor third, the D note fretted by the middle finger on the B string. This is left out of the power chord, so it’s not minor anymore.
Power chords, by their nature are not major or minor:
I just googled and the AI returned this: “Power chords are neither major nor minor because they consist only of the root note and the perfect fifth, lacking the third that defines a chord as major or minor. This gives them a versatile sound that can fit in various musical contexts.”