Tommy

What we know

Undead knight on River Ivlis bridge near Tser Pool falls (Session 7 @ 02:22:09)
Member of Order of the Silver Dragon; true name forgotten in death (Session 7 @ 02:31:07)
Party nickname Tommy; knight indifferent to name (Session 7 @ 02:45:30)
Banished by commander Vladimir Horngaard for urging action against Strahd von Zarovich (Session 7 @ 02:32:56)
Bound to stand watch; cannot leave post or take arms against Strahd (Session 7 @ 02:33:28)
Honor-bound; cannot lie (Session 7 @ 02:40:57)
Directed opposition to Strahd toward Argynvostholt and Sir Godfrey Gwilym (Session 7 @ 02:31:53)
Warned wolf-shifters walk as wolf, man, or between; haunt western forests (Session 7 @ 02:38:28)
Party later compared his warning to van Richten manuscript's three-form lore at camp before Vallaki (Session 8 @ 00:26:39)
Recognized Silver Dragon Pendant from cliffside watchtower as order relic (Session 7 @ 02:52:45)
Headless road rider is "the wandering one" seeking mists escape; will never succeed (Session 7 @ 02:40:12)

On River Ivlis bridge during travel from Tser Pool toward Vallaki (Session 7 @ 02:28:55).

Mercurio insight 19: knight spoke truth as he understood it (Session 7 @ 02:57:15)
Sylalys showed pendant after party crossed; knight returned it with matching relic shown (Session 7 @ 02:52:45)

Unconfirmed: whether knight secretly serves Strahd despite claims (Session 7 @ 02:55:49)
Unconfirmed: order of knight awaits that will never come (Session 7 @ 02:33:28)