Just noted on the wikia that Maigadi does bonus damage against merctype2 which is a special tag that also includes Maigadi, which I found very funny.
It also means that Maigadi does x2.25 against ninjas and bonus damage vs spies. Which is kinda fitting since its supposed to be protecting against assasins
Are there other cases of units doing bonus damage against themselves I wonder? I guess JPK does that since they are also heavy infantry
Some others are
-Culverins, age 4 flaming arrows, light cannons, hand mortars, siege elephants.
-Pandours, Hajuk, Royal Hunter/Huntsman, Schiavone
-Flamethrowers
-Huaracas
-Ninja
-Tartar archers
-Counter dragoons from the Russian church card/Russian consulate
-Cossack Daredevil
-Nizam Fusiliers in one of their modes
-Chinaco
-Fire thrower with the age 4 card
-Berber camel
-Carib blowgunner
-Zapotec lightning warrior
-The Berber Sultan with the charged attack