1. C Major Modes Triads Diagram

In the C Major Modes Triads Diagram you can see the y chord types in triad form.

Remember: Mode 7 (starting on the note B) is, as a 3-note harmony, just a diminished chord.
It’s proper role of Half-Diminished does not become clear till you add the 4th note. (see next diagram)

Chord diagrams color codes
C Major Triads Chords Diagram