Hey, I noticed that Tadashi had disappeared for two years. Not sure if you explained it already and I was curious. I know that lil picture that you drew had his health on it did it say anemisa? Was that the reason he was gone for two years?
Basically, he survived the fire but got a rather nasty hit on the head that simultaneously put him in a coma for two years and knocked most of his memories out of him. He has retrograde amnesia. The reason he was gone for two years was mainly due to the coma (though it would more than likely be more like two and a half years if you want to be realistic because he'd need some physical therapy and some time to get situated also)
It's something that'll be explained in a bit more detail in one of the backstory comics I have planned.