Community counterplay
Counterplay note
After hellsweep or knockdown, stay grounded and side-roll instead of auto tech-rolling into vortex. Force him to use ground-hitting options like f,F+4.
Source: YouTube: 1 Tip against EVERY Character in Tekken 8
These notes are public community matchup references. Verify details after Tekken 8 patches.
Related answers
As Yoshimitsu against Kazuya, sidestep or sidewalk either direction against 3 (Face Kick), then punish with UF1 Kincho~B2 1.
Source: YouTube: All Strings you can sidestep against Kazuya
As Yoshimitsu against Kazuya, sidestep left against 1,2,4,3 (Twin Fang Double Kick), then punish with SS2.
Source: YouTube: All Strings you can sidestep against Kazuya
As Yoshimitsu against Kazuya, sidestep or sidewalk either direction against df+3,2,1 (Impaling Knee Twin Thrust), then punish with UF1 Kincho~B2 1.
Source: YouTube: All Strings you can sidestep against Kazuya
As Yoshimitsu against Kazuya, sidestep or sidewalk either direction against b+2,2,1+2 (Danzui Raizanba), then punish with ss2.
Source: YouTube: All Strings you can sidestep against Kazuya
As Yoshimitsu against Kazuya, punish 1,2,4,3 (Twin Fang Double Kick) with WS1 2.
Source: YouTube: Yoshimitsu full Punishment Guide against Kazuya