Susan and Ron
There weren't too many six foot something redheads at the Ministry, so short of dyeing his hair there wasn't a great deal that Ron could do to disguise his identity. He'd chosen a very simple black mask and was wearing the same black dress robes that he'd worn to his wedding earlier in the year. He was going to leave the truly extravagant outfits to the women, though if anyone cared to look close enough he wore a smudge of dark eyeliner around his eyes. Somehow, it made his eyes look bluer, but it wasn't something Ron planned to make a habit of.
No sooner had Ron left Hermione talking politics with a colleague then he was accosted by a short witch in purple who insisted on getting his opinion about the apparent campaign to get Harry selected as Minister by the Wizengamot. He was extremely grateful to see a flash of red hair. Not a family member, but good enough. "Hey, Susan. I was just looking for you." He gave the witch a quick apology and headed over to Susan, casting a furtive look back over his shoulder.
"Okay," he admitted in a low voice, "I wasn't actually looking for you, but I was looking to get out of that conversation." He frowned, peering at her mask. "It is Susan, isn't it? Otherwise I'm just making an arse of myself, y'know?"