As I've said in Announcements I find Groose to be a very worthy character (my favourite from SS) with a healthy growth and funny, original and charming mannerism. He also was one of the only characters in LoZ to ever take initiative rather than wait for Link saving the world. Despite being a silly jerk, he's also shown a great deal of intelligence with his invention of the catapult.
I think he could a very good addition to HTW despite Neph's prejudices against comedic relieves: He could be the total opposite of Lnk in every aspect:
Here follows some late game spoilers:
As for the Pig, I really loved HTW Ganon, he felt like the best built character. Shortly, he felt his duty to be good because of what his mother told him, but since he's a Moblin, he tried to achieve it in a very brutal and "all or nothing" manner.
Anyways, on the subject of Link: he seems to be quite obvious to evil: with all the monsters he kills without flinching (in T'sM he outright sneaks into the palace of Hyrule and kills a lot of guards), and let's not speak about breaking into people's homes and smashing their pottery. Neph seems to hint at this as well:

Originally Posted by
UndyingNephalim
Link will probably think he's a white knight doing what's best.
