This is coming from a Litchi main:
overheads mix-up:
1-Litchi with staff: Block always high once she starts her block-strings with 5B; she has kinda fast overheads, 4D and 6A, and a slow low, 3C, that can galtling from 5B or the moves after.
once you block her 4D overhead, most litchis will go for kote > j.B > pressure ..... you can land a 360A while she's doing kote > j.B with no problems.
the other overhead 6A is sorta hard to punish coz most litchis do it after 5B which pushes you back a little so it's best to backdash whenever you block it, but you can land a 720 when in range.
2-Lithci without staff: now block low coz she has a very fast low, haku, and two slow overheads.
Anti-Air:
ohh I can guarantee you 80% of litchis are gonna spam j.B and j.C with staff like crazy, so make 2C your friend whenever you expect a jump or see one coming; also 2C beats litchi's j.B crossup or trades sometimes, but hell, it's an awesome trade.
2A works really well against j.C and kinda ok with j.B, use it if you are afraid 2C will whiff or something.
In the corner:
you are DEAD
please feel free to correct me if i'm wrong