Mage, the most beginner friendly characters in DOA5U are;
Momiji
Ein
Genfu
Hayate
Hitomi
Rachel
Kasumi
Ein and Genfu are the most well-round in that lot. Ein is simple, straight forward, has very good damage, and is very well balanced.
Genfu (my sub) is simple, has very good damage, and is a monster in CQC (close quarters combat). If you were to give Genfu a shot, I can certainly help out with that.
Momiji is probably the most beginner friendly character in this game. Very good damage, one of the best whiff punishers in the game (66PP), good pressure, good movement and mix up.
Hitomi is straight forward like Ein is. However, she has a lot more string variety and mix ups than he does. Very good damage, amazing KBD ability, solid whiff punishment, good tools and good pressure.
Hayate is a solid and well-rounded ninja on the roster. He's got good mix up, good mobility, and solid damage.
Rachel is very good, although she is slower than the rest of the female cast because she is a super heavy weight. But she has solid but straignt forward strings, pressure, and good damage.
Kasumi is fast and she has solid damage overall. Pretty good tools, good mix up, good pressure.
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ZOo00OOm if you need some assistance on Ayane, I'm at your service. Anyone that is anyone in the DOA community knows I'm the go to player for Ayane depth.