Ohai der, Arika's upgrade's coming up, might as well detail all 3 anime-canon ones. Note that, for the most part, it is simply a matter of "moar power" and a new weapon. The Robes pretty much all work the same way.
It is of note, that Arika's GEM, the Blue Sky Sapphire, is not a normal GEM, and instead a "Super Meister Gem", more powerful than normal Meister GEMS (which are, in turn, more powerful than the students' Pearl and Coral GEMS). When properly utilized, it is on a level at least equivalent to those of the 5 Columns (special Otome whose Master is the Predecessor herself, and who serve a bit as the Otome "police" force), if not much higher. The limits of its power are not revealed in the series.
Blue Sky Sapphire (Ver. 1) (http://www.my-zhime.net/tv/character/img/img_p_arika3.gif) Arika's first Meister Robe, gained from the contract with Mashiro. It's more powerful than her Coral Robe, and actually more powerful than most Meister Robes, though not as powerful as those of the 5 Columns. This Robe is actually an incomplete Robe, as Arika cannot unlock the full potential of the Robe. Arika's Element in this Robe is a two-bladed crystal sword (http://www.my-zhime.net/tv/character/img/img_p_arika4.gif) of sorts, which can also be enlarged to giant size (http://www.my-zhime.net/tv/character/img/img_p_arika5.gif). While she can fight with it in it's larger form, primarily the larger form is used for her special attack, Bolt From the Blue, which is a giant beam attack. Terrain Stats: Land: B Air: A Sea: C Space: B Note: As you never see any Otome fight underwater, the Sea stat is assumed due to there being no penalty when they fight in space. However, Arika herself needs to be taught how to swim, first.
Blue Sky Sapphire (Complete) (http://www.my-zhime.net/ova/character/img/img_p_arika3.gif) Arika's complete Meister Robe, obtained . Arika's power in this form is at least equivalent to the Columns, if not more powerful. The full extent of her powers is unknown, although her mother, using the same Robe, was able to access many more abilities than Arika has shown*. In addition to her regular Element, Arika also can wield the Sword of Akatsuki (http://i96.photobucket.com/albums/l183/Dessa_Gepichu/Misc%20Anime%20Crap/SwordofAkatsuki.jpg), a powerful artifact in its own right. After its initial use in the TV series end-canon, Mashiro has to separately authorize this Robe, which is activated by Arika calling "Materialize Zwei". . Terrain Stats: Land: A Air: S Sea: C Space: S
Blue Sky Sapphire (Ver. 1.5) (http://www.my-zhime.net/ova/character/img/img_p_arika2.gif) After the events ending the TV series, this becomes Arika's default Robe (as, as stated above, her complete Robe requires separate authorization). It is similar in appearance to her first Meister Robe, except with blue highlights and extra power. In terms of battle, it is simply a more powerful version of her earlier Robe, but less powerful than her complete Robe. She is roughly on the same power level (or slightly lower) as the Columns in this form. Terrain Stats: Land: B Air: A Sea: C Space: A
Dessa | Arika Yumemiya | My-Otome
It is of note, that Arika's GEM, the Blue Sky Sapphire, is not a normal GEM, and instead a "Super Meister Gem", more powerful than normal Meister GEMS (which are, in turn, more powerful than the students' Pearl and Coral GEMS). When properly utilized, it is on a level at least equivalent to those of the 5 Columns (special Otome whose Master is the Predecessor herself, and who serve a bit as the Otome "police" force), if not much higher. The limits of its power are not revealed in the series.
Blue Sky Sapphire (Ver. 1) (http://www.my-zhime.net/tv/character/img/img_p_arika3.gif)
Arika's first Meister Robe, gained from the contract with Mashiro. It's more powerful than her Coral Robe, and actually more powerful than most Meister Robes, though not as powerful as those of the 5 Columns. This Robe is actually an incomplete Robe, as Arika cannot unlock the full potential of the Robe. Arika's Element in this Robe is a two-bladed crystal sword (http://www.my-zhime.net/tv/character/img/img_p_arika4.gif) of sorts, which can also be enlarged to giant size (http://www.my-zhime.net/tv/character/img/img_p_arika5.gif). While she can fight with it in it's larger form, primarily the larger form is used for her special attack, Bolt From the Blue, which is a giant beam attack.
Terrain Stats:
Land: B
Air: A
Sea: C
Space: B
Note: As you never see any Otome fight underwater, the Sea stat is assumed due to there being no penalty when they fight in space. However, Arika herself needs to be taught how to swim, first.
Blue Sky Sapphire (Complete) (http://www.my-zhime.net/ova/character/img/img_p_arika3.gif)
Arika's complete Meister Robe, obtained . Arika's power in this form is at least equivalent to the Columns, if not more powerful. The full extent of her powers is unknown, although her mother, using the same Robe, was able to access many more abilities than Arika has shown*. In addition to her regular Element, Arika also can wield the Sword of Akatsuki (http://i96.photobucket.com/albums/l183/Dessa_Gepichu/Misc%20Anime%20Crap/SwordofAkatsuki.jpg), a powerful artifact in its own right. After its initial use in the TV series end-canon, Mashiro has to separately authorize this Robe, which is activated by Arika calling "Materialize Zwei".
.
Terrain Stats:
Land: A
Air: S
Sea: C
Space: S
Blue Sky Sapphire (Ver. 1.5) (http://www.my-zhime.net/ova/character/img/img_p_arika2.gif)
After the events ending the TV series, this becomes Arika's default Robe (as, as stated above, her complete Robe requires separate authorization). It is similar in appearance to her first Meister Robe, except with blue highlights and extra power. In terms of battle, it is simply a more powerful version of her earlier Robe, but less powerful than her complete Robe. She is roughly on the same power level (or slightly lower) as the Columns in this form.
Terrain Stats:
Land: B
Air: A
Sea: C
Space: A