In Dofus, Feca is the obvious tank as a tank is an armoured battlemachine that noone can tank, which is obviously the Feca. But indirect, sacriers are tanks since they go in front at take the hits, since they have a lot of hp. Iops are also very close combat focused, and therefore kinda 'forced' to have a bit of hp, to survive.
As an example, your 194 iop has 3.4k hp without any sucker parts, where most around your level(Dofus gold) have around 2.8k hp, which makes you the tank. Also there is resistance, so if you wanna be a tank and aren't a feca, a good resistance set would work, in some way, if you dealt with monsters that did single element attacks, or pvp'ed against a player who only used one element.
Classes such as Pandawas, have get's Pandawasta at higher levels(Dofus powerleveling), which is a summon with around 1k hp and massive amounts of agility, that locks most enemies, so it can in some sort be your little tank. Enutrofs can MP theft and range rapes, which makes no need of a tank, since they the monsters can't reach you. Eni's can heal so they could also work.
Well, what we are trying to show you is that there are many aspects of the "tanking". In many cases, of course it won't be exactly, in many cases not even the obvious tanking feca.Thank you for reading!^_^