This is Hakuba Saguru, and for the first seventeen years of his life, he was almost a canon Hakuba Saguru. Then, he died. Except, thing is, he didn't stay dead - he regenerated. With, of course, a little help from the Doctor, and his mother's old chameleon arch pocketwatch. You know, the other one he always carried around with him. Since then, due to both necessity and having been there at the time, Kaito is now his closest friend. Still not exactly best friends the way Shinichi and Hattori are, but the closest friend that Hakuba's got at the moment. Especially since, you know, he has to dye his hair blond now. And use makeup to hide the fact that his skin's darker. Oh, and his eyes are a darker blue than before. Did I mention he's about an inch shorter? He is.
Personality wise he's almost exactly the same as before, but more likely to take things easier, and more likely to believe the unlikely. He's still somewhat at odds with just about anything social, though.