I can only give my opinion on this coin, and it's just that .. an opinion. If you look at all examples and styles of Athalaric monograms there is an obvious letter "R" at the left, with the vertical line of the R forming a portion of the letter "A". These two letters are missing on the monogram example you show. On all his monogram coins you can make out the letters, A-T-H-R-I-C-V and S with a clear L seen on three of the six published types. On the monogram shown the only letters I can make out are T-H-C-I-S. It just doesn't seem likely that Athalaric would strike a monogram with just these letters, particularly without the A and R. I am not going to make a guess as to what, or who, this coin represents but it just doesn't fit this particular Ostrogothic Emperor.
Thanks for comment Brian! yes am confused too with the missing of the A and R letters in order to atribute It to Athalaricus, but It looks to me the most probable king. Hope reveal this mystery