Forgottenlor, in order to answer your question a little better, I just started up Ys: The Oath in Felghana. It's KB+M friendly, but it takes some tweaking. It's not 100% smooth since the config menu likes to leave one of your mouse buttons locked up for the option of mouse movement (like in Diablo). But if you bind movement to WASD and attack/talk/OK to LMB with jump to space, it's not too bad. If I remember right, Ys I + II were playable with KB+M too, though a controller is much better for the Ys series. And by the way, Ys is a fun series. It doesn't have quite the depth of, say, Legend of Heroes, but it's great if you're in more of a twitchy, hack-and-slash mood. And they all have a really good soundtrack, especially the first one.
I've only played Hyperdimension Neptunia 1 so far, but it's actually not very well optimized for KB+M. I mean you can definitely do it but the publisher didn't go a long way toward making it KB+M friendly. I haven't played Fairy Fencer F yet but my guess is that it's almost identical in the controls area since it's almost identical to Hyperdimension Neptunia.
Celestian Tales is a nice game, and since it was made for the PC (I don't think this one has a console release at all) it's definitely KB+M friendly. I played with the gamepad, I think, so I couldn't tell you how it plays otherwise. I'll have to reinstall to find out.
Tales of Zestiria is definitely KB+M friendly. That's how I played it, and it plays really nice.
Agarest is alright with KB+M, though it's slightly awkward.
And I am really really curious about Arslan: Warriors of Legend, if anyone has any info. It's a Dynasty Warriors-style game, too.
Oh! And on a J-Non-RPG note, Nobunaga's Ambition: Sphere of Influence is made for PC and it's really good. Though it's stupidly expensive…try to get it on sale or find some other way of playing it. ^.^;;