Champions with true damage:
Ahri (Q)
Amumu (passive)
Aurelion Sol (E execute)
Bel’Veth ®
Camille (Q)
Cho’Gath ®
Darius ®
Draven ®
Fiora (passive + R)
Gangplank (passive + R)
Garen ®
Gwen (Q)
Kog’Maw (passive)
K’Sante (passive)
Lillia (Q)
Master Yi (E)
Olaf (E)
Pyke ®
Rek’Sai (E)
Sett (W)
Syndra (W with fully stacked passive + R execute)
Twitch (passive)
Urgot (R execute)
Vayne (Q)
Vel’Koz (passive)
Yone (E)
Zoe (E)
Gp, rek’sai, ksante maybe garen?
True damage isn’t that problematic imo, biggest offender is ksante ofc but most other champs have a reason / wouldn’t make sense without it.