I’m going to start with my most played game and work backwards from there. So… K for Kerbal Space Program.
Maybe not the best choice in terms of number of games but I’d still get stuff like
- Knights of the Old Republic
- King’s Quest
- Killer Instinct
- Katamari
- Kingdom Hearts
- Killzone
- Kirby
Probably others, but obviously not as extensive as a letter like S or T. Still I would probably opt to pick the letter with my favorite game of all time in there than one that just gives more options.
Sega Saturn and Dreamcast also probably factored in. They weren’t nearly as successful as the Genesis. With even established brands floundering it’s no wonder people didn’t think the Playstation would work.