So I've been designing pseudo EDH decks around our Planeswalker characters. I've used Niv-Mizzet and Crosis for Claire, Tariel for Lance, and Uril for Jareth. For Gibrael, I found a bunch of big white spirit legends and some soldiers/clerics. For Yuu...that's harder, finding a RU legend that fits, as there are only four of them. Buti think Nin the pain artist fits best of the four. Vernach is also a doozy, BU is an interesting combo. So I went with wrexial and filled the deck with demons, illusions, shapeshifters, and nightmare horrors.
I gave Rimuel, Jor kadeen; Thamien got Damia and the Mimeoplasm; Morgana got Sen Triplets/Sharuum/Dromar, none of which fit all that well, but those are Her colors. Rckaird and Thay are still up in the air. I really want to give Rckaird Krond the dawn clad, but...Green. Have to find something appropriate in UW. And Thay...don't even get me started on how hard it is to find a RBG legend that fits a "small and fiery" deck.