Legion Magic: Supergirl

Legion Comments: 
The Kryptonian Kara Zor-El actually became a  Legionnaire before her cousin Superboy. She joined at the same time as her soon to be romantic interest, Brainiac 5. She died fighting the Anti-Monitor during the Crisis on Infinite Earths.

Magic Comments: 
The powerhouses, Mon-El, Supergirl, and Superboy, are all the same ability-wise with the added Time Travel (my take on Magic's Ninjutsu) for the super cousins. Power & Toughness differs as per the comics, from Mon-El (strongest) to Supergirl (middle) to Superboy (weakest).

Legion Magic: XS

Legion Comments:

The super speedster Jenni Ognats is the daughter of Dawn Allen, one of the Tornado Twins, and the granddaughter of Barry Allen, the Flash.

Magic Comments:

Her first ability is a variation of one of Godo, Bandit Warlord's, while her second reflects her using super speed to remove teammates out of harm's way.

Legion Magic: Tellus

Legion Comments:
Ganglios was born on the giant water-like world of Hykraius.  The telekinetic telepath is forced to wear breathing equipment that simulates the methane-based "Great Mother Ocean" of his homeworld.

Magic Comments: Combined the second ability of Simic Guildmage with a lesser powered version of Carry Away.