Rumelian troops:

Harami's were a category of soldier recruited from ordinary Christian bandits/hajduks. They didn't recieve a salary, weren't tax exempt and earned their compensation solely from loot and plunder. Basically, the Christian equivalent of a "Bashi Bazouk". The lowest rank of Christian auxiliary in the Ottoman military.
Derbenci's were the second lowest ranking of armed Christian auxiliaries in the Ottoman military. They were posted to guard mountain passes in the Balkan provinces, being of ordinary peasant stock, yet still one rank above Harami's in that they were exempt from paying taxes.

Martoloses, especially in the context of Ottoman military forces in Hungary, were paid infantrymen of Balkan Christian origin assigned to guard fortresses and provide internal security to the provinces. Being salaried troops, they were higher in rank than both the Harami's and Derbenci's (though remaining lower in rank than Voynuks and Pandors) and were employed in large numbers in Hungary during the 16th and 17th centuries.

Voynuks were the highest ranking of Christian soldiers in the Ottoman Empire. They consisted both of infantrymen and of cavalrymen drawn mostly from the ranks of Slavic landholders in Bulgaria, with 40,000 being registered in the 16th century. In times of peace, they tended to the Sultan's stables, while in war a significant contingent were deployed to Hungary as raiders. The estate of a deceased Voynuk sancakbey (commander) from 1553 reveals that they generally carried light weapons such as maces, swords, axes and bows, in addition to being armoured. Historical depiction of a Voynuk: https://agronovinite.com/wp-content/uploads/2018/09/Voynuk.jpg

Pandors were a force of mostly Balkan Christian (albeit with some Muslim composition in later times) arquebusiers drafted in the later 16th century to counter the rising threat of brigands armed with firearms, inspired by the Hungarian/Croatian Pandurs (https://en.wikipedia.org/wiki/Pandur). They received a regular salary for their service and remained relevant for the longest out of any category of Christian auxiliaries.

My information about the Christian auxiliary soldiers comes mainly from "A MILITARY HISTORY OF THE OTTOMANS" by Mesut Uyar and Edward J. Erickson, available through google search as a pdf, and "The Ottoman Military Organization in Hungary" by Klara Hegyi (available as a pdf on libgen.rs)

Rumelian lords:

As for lords with Rumelian culture, the first I'd suggest is Peter Petrovics (the Serbian lord of Temesvar already included in the mod). However, there is another historical figure which could potentially be interesting for the context of the mod.

Peycho Beleni was the first to hold the title of Agha (lord) of Hasekiya, an area of Strandzha (modern southeastern Bulgaria) granted to him herediterily by Sultan Selim I in exchange for supporting him in a civil war during the first half of the 16th century. He governed a string of 17 villages (the most important being Fakiya) and a fortress (Urdoviza, near the modern village of Kiten) as a feudal territory in exchange for commanding a detachment of Voynuks on behalf of the Ottoman military. While Peycho Beleni himself isn't as accomplished as later members of the family, he is still important because he began a dynasty which would rule Hasekiya until 1834. Stoyan, a later member of the Beleni clan, died fighting for the Ottomans in Vienna in 1683, while Marincho received a ribbon from Swedish King Carl XII after accompanying him to safety during the battle of Poltava in 1709. The Beleni clan wore a hat and bag gifted to them by Selim I to signify their status as hereditary lords. Members of the family regularly rebelled against the Ottomans, as was the case with Stoyan Beleni's older brothers in the 17th century, and again in 1834.

Modern day recreation of the tombstone depicting Marincho Beleni wearing the hat and bag passed down in his clan from Selim I:
http://www.burgasmuseums.bg//cache/images/uploads/albums/album210/480x350_PTDC0154.JPG
Based on this tombstone:
http://www.burgasmuseums.bg//cache/images/uploads/albums/album210/629x1000_PTDC0153-(2).jpg

My sources for this are mostly written by Bulgarian historians, unfortunately I can't find anything on the English-speaking internet for you.
http://www.burgasmuseums.bg/index.php?page=encdetail&id=192
http://macedonia.kroraina.com/ss/ss_12.html