GBVS/Lancelot/Strategy

General Tactics

Lancelot thrives after getting in through maintaining heavy pressure. A lot of these tools to maintain pressure are his fireball, especially the ex version, his teleport and his unique ability. Lancelot also has some exceptionally strong midscreen whiff punishes that you should try to employ.

Blockstrings

c.M > c.M > f.M xx 214L

This sequence requires momemtum, frametraps and leaves lance 0 or +1 against some characters. You can pressure reset in this string at any point with micro dash c.M again or cancel into 22X.

2L > 2L > 2M > 214L

Solid pressure string, combos on crouchers.

2L > c.M > 2M > 214L

Same as above, but also combos on crouchers.
Lancelot's Rekka is also an important tool for pressure. By mixing between 214L, 214L~L, and rarely 214L~L~L, he can condition the opponent not to press buttons as rekkas create frametraps. They're also safe on block until the final follow up, allowing for quick pressure resets. Once the opponent has been scared into blocking by counterhit combos from rekkas, you can start to mix in 22X and 236X. If this happens, you've won.

Okizeme

Lancelot has good tools for Okizeme that allow him to maintain heavy pressure after a knockdown. Two primary forms of oki Lancelot has are his EX Fireball and Teleport. The EX Fireball can lock down the opponent to create setplay opportunities while the Teleport can create a mixup scenario. There are some additional strategies you can employ such as late 2U which can either whiff or hit safe depending on your timing.

Fireball/EX Fireball

The main way you're going to get this is after 66L/66H or a Combo Limit flip-out. Normal Fireballs allow you to get a low/throw mixup, and EX Fireball on wakeup effectively turns your soft knockdown into a hard knockdown and gives a safejump. Granted, they have to block it first. You're most likely going to go for several high/lows with 2L and Universal Overhead.

Teleport

This is the better option to use after a hard knockdown. Lancelot's air buttons give you the ability to do either 1 overhead (j.M), 2 overheads (j.H), crossup low (j.U > 2L) or same side low (land > 2L). The crossup can mostly be negated by the block button, but against an unaware opponent it is extremely effective to catch them off guard.