The_Lost_King said:
Diablo 1-3(all on blizzard's store not steam),Titan quest, he could preorder torchlight 2 and get Torchlight 1 free.
I've used the keyboard quite a lot in D2 - shrotcuts to spells, abilities, drinking potions, hit Alt to see what's on the ground. Sure, you can also only use the mouse, but that would need a slower pace, something you can't often afford. And similar thing goes to the other titles, unless keyboard for speed isn't much of an issue there.
I'd suggest turn based games: Heroes of Might and Magic (1-5 are on GOG, 5 and 6 are on Steam, 3 is a classic, but 5 almost "that + better graphics and good changes"), also Disciples (1 and 2, also on GOG - I've played 2 and recommend it), Civilisations (on Steam), and so on. I've been having fun with Might and Magic Clash of Heroes - it's a nice little game with puzzle based combat. Annoyingly, you can't use only mouse, as you need to hit Escape somewhere, because thhere is no "back" or "exit" in the menu, it's not a huge issue, but I can't just lean back with my mouse and play it.
Also, possibly even the Commandos series (on GOG) - they aren't turn based, but from what I can recall, you can play them with mouse only, also Desperados, which is like Commandos in the Wild West, and there was a Robin Hood game in the same vein.
And, uhm, Bayonetta. Hey, it had to be said, right?