HR diagram of all Gaia DR3 nearby stars with a parallax of π ≥ 5 mas, using the broad-band G magnitude versus the colour G_BP (blue) minus G_RP (red). The colours indicate log(g). Stars without a log(g) measurement are shown in grey. The six targets presented in this paper as part of the NIRPS-GTO giants sub-programme are overplotted (outlined black circles), along with five stars identified as giant stars using this method. TOI-3288 and TOI-4666 (outlined black squares), hosting gas giants, are visible on the main sequence. This figure can be generated using Gaia-HR, available at https://github.com/ygcfrensch/Gaia-HR.