Tygra, the invisible.
Tygra is the one who can make all sorts of technical designs. As Panthro once
said; 'whatever you can design, I can build' which about says it all. Tygra
developed things like the Catslair, the Thundertank, and many more inventions
which would follow at a later stage.
Out of all the ThunderCats Tygra always was the most favoured by a lot of viewers.
Besides this; if there would be something like a relationship between a male and
a female ThunderCat everyone mentioned Tygra and Cheetara being these two.
Of course this was during the first episodes; later there was a second female
ThunderCat called PumMyra and I kinda lost track after that. As all the other Cats
Tygra also has some weapons and powers of his own. He uses an energized bolo-whip
as his weapon which is also somewhat magical (since the weapon can vary in size).
Using his whip Tygra can make himself invisible.