Bulgarian Paladin, Xbow, or Champion all come to mind
Teutonic Knights for the Mongols.
Cos Drill.
Mongols bombard cannons or organ guns with the siege UT (I don’t remember the name 11)
Malians with Paladin (Paladins bonk you harder)
Bulgarians with Paladin (Paladins bonk you faster)
Dravidians with Huskarls (1 unit counters all)
Franks with Hussar (tanky trash)
Malay with Champions (trash Champs goes brr)
Persians with Arbalest (best trash unit?)
Shrivamsha rider, without any modification.