The full list of housemates here:
en.wikipedia.org
I'm starting with a couple of HMs from each series then will narrow it down. They're not necessarily my favourites, just ticking casting boxes and picking housemates who made an impression, whether good or bad. In all likelihood with the early series I'm getting the names mixed up anyway.
1: Blair and Sara-Marie
2: Marty and Jessica (struggled recalling anyone from this series but were these two the couple, so that ticks the showmance box)
3: Regina and Chrissie
4: Ryan and Merlin
5: Tim and Vesna
6: David and Dino
7: Alesha and Zach
8: Brigitte and Nobby
9: Layla and Estelle (seemingly the only series where I can put a face to every name)
10: Tahan and Tully
11: Priya and Skye
12: Angela (the tea lady?) and Xavier
13: Marley and Daniel (think I hated Daniel as he got the producers edit but he's the only other one I remember)
14: Taras and Tim (didn't watch this at all)
15: Graciemae and Jake
Found it tricky to pick a second for series 11-14, or anyone from series 2 (as I'm just not that familar with it). Will narrow it down later to around 15 housemates.