Probably above Fred or Glade, maybe even above Xavier. As for Ronan, I dunno, all he's really got going for him is Continue and that's about it. 1 PCC, doesn't support anyone and is only supported by Leaf doesn't really help when his STR's even worse than Tanya's.
Probably above Glade, Glade's leadership star and A rank in lances is great but he's not going to be much use on indoor maps with his E rank in Swords, Tanya can be used both indoors and outdoors since she only has to use bows even though she has starts with an E in Bows its possible to raise it to a C rank at least before chapter 13? and also Glade is prepromoted wont get much exp in non elite mode and is the difficulty of recruitment also used in this tier list?
This, though I must ask how is Glade difficult to recruit?
Sorry I meant that for Xavier's part.(and some other characters)