The backbone of Litchi combos. While this is almost always immediately followed up with Midscreen Middle B, there are various situations where you will want to do a different route after this, or use Midscreen Middle B on its own. What filler you can do depends heavily on the starter and what route you are attempting to fit afterwards, as well as decisions like attempting to sideswap. Adding less filler will allow Litchi to pass through the opponent during 63214Ae, and steal back the corner after Left/Right mixup. Additionally, 214Bm can be skipped if Litchi is already near a placed staff.
- Midscreen 5Bm starter: 5Bm 5Cm1 3Cm 214Bm 236Ae 236Be 63214Ae~B -> Midscreen Middle B - 3846
Most staffed combos will allow you to use 236Ae as filler, since 3Cm 214Bm or 2Cm 6Dm1 dl 214Bm both launch the opponent high enough to do this. This is not always the case, as mixed staffless and staffed routes will happen.
- Corner, 5Be starter: Vertical ]D[, 5Be 5Ce 3Ce 214Bm 5Be 236Be 63214Ae~B -> Midscreen Middle B - 3269
The filler in this case is required, as otherwise the route doesn't have the height for 63214Ae~B to combo, but it doesn't only have to be 5Be. 5Be 6Ce2 will also work as filler off 5Be starter and does more damage, but doesn't work if the starter is ]D[.
What filler you can or want to do is highly variable based on the situation, so experiment!