Adapting Angelo's Name Patch

I'm just throwing an idea but since your problem is in battle there is the esper menu script:

Code:

(Esper menu drawing script.)
C2/E083:    FF FF       (Draw 2 spaces)
C2/E085:    84ACA99E    (Draw "Espe")
C2/E089:    AB FF FF    (Draw "r  ")
C2/E08C:    04 21       (Change tile palette to #$21)
C2/E08E:    1A 00       (Draw Esper name)
C2/E090:    05 04       (Draw 4 spaces)
C2/E092:    03 2C       (Draw 'M', except that's the wrong value)
C2/E094:    03 2F       (Draw 'P', except that's the wrong value)
C2/E096:    FF      (Draw ' ')
C2/E097:    16 00       (Display MP cost)
C2/E099:    00      (End script)

It's either this (remove the 4 spaces maybe) or something in bank $C1. Bank $C3 is overworld menu so it's not related.