Up to twenty characters, the only special usable are singular quotation marks, dunno how they are called.

Here are some suggestions I already made:
Birb'up
̷>̷R̷o̷m̷a̷n̷i̷a̷ ᵘᶰᶠᵒʳᵗᵘᶰᵃᵗᵉᶫʸ ᵈᵒᵉˢᶰ'ᵗ ʷᵒʳᵏ⋅
Bavi
Tenshi
Duck
Yellowduck
Duckstrider
Waddler
Quacker
Aaaaaaaaaaaaaaaaaaaa ᶰᵒᵗ ˢᵘʳᵉ ᶦᶠ ᵃᵛᵃᶦᶫᵃᵇᶫᵉ⋅
>some anime girl you would want to mount-up

For extra description, my character's name is Bigby Knee-high and Bavi is from the Immortal Flame company, so for now it will have flames and shtick, before I get him some maido outfit.