To use just open your decompressed save into Hex Workshop and change the Hex value of a Character's name or a weapon's name to the Hex value of the desired symbol you want (There are already TONS of tutorials on how to decompress your save, so I won't bother going through those steps).
NOTE: Some symbols don't work and will not show up in-game.
Code:0A- 21- ! 22- " 23- # 24- $ 25- % 26- & 27- ' 28- ( 29- ) 2A- * 2B- + 2C- , 2D- - 2E- . 2F- / 30- 0 31- 1 32- 2 33- 3 34- 4 35- 5 36- 6 37- 7 38- 8 39- 9 3A- : 3B- ; 3C- < 3D- = 3E- > 3F- ? 40- @ 41- A 42- B 43- C 44- D 45- E 46- F 47- G 48- H 49- I 4A- J 4B- K 4C- L 4D- M 4E- N 4F- O 50- P 51- Q 52- R 53- S 54- T 55- U 56- V 57- W 58- X 59- Y 5A- Z 5B- [ 5C- \ 5D- ] 5E- ^ 5F- _ 60- ` 61- a 62- b 63- c 64- d 65- e 66- f 67- g 68- h 69- i 6A- j 6B- k 6C- l 6D- m 6E- n 6F- o 70- p 71- q 72- r 73- s 74- t 75- u 76- v 77- w 78- x 79- y 7A- z 7B- { 7C- | 7D- } 7E- ~ 82- ‚ 84- „ 85- … 87- ‡ 88- ˆ 89- ‰ 8A- Š 8B- ‹ 8C- Œ 8E- Ž 91- ‘ 92- ’ 93- “ 94- ” 95- • 96- – 97- — 98- ˜ 99- ™ 9A- š 9B- › 9C- œ 9E- ž 9F- Ÿ A1- ¡ A2- ¢ A3- £ A4- ¤ A5- ¥ A6- ¦ A7- § A8- ¨ A9- © AA- ª AB- « AC- ¬ AD- * AE- ® AF- ¯ B0- ° B1- ± B2- ² B3- ³ B4- ´ B5- µ B6- ¶ B7- · B8- ¸ B9- ¹ BA- º BB- » BC- ¼ BD- ½ BE- ¾ BF- ¿ C0- À C1- Á C2-  C3- à C4- Ä C5- Å C6- Æ C7- Ç C8- È C9- É CA- Ê CB- Ë CC- Ì CD- Í CE- Î CF- Ï D0- Ð D1- Ñ D2- Ò D3- Ó D4- Ô D5- Õ D6- Ö D7- × D8- Ø D9- Ù DA- Ú DB- Û DC- Ü DD- Ý DE- Þ DF- ß E0- à E1- á E2- â E3- ã E4- ä E5- å E6- æ E7- ç E8- è E9- é EA- ê EB- ë EC- ì ED- í EE- î EF- ï F0- ð F1- ñ F2- ò F3- ó F4- ô F5- õ F6- ö F7- ÷ F8- ø F9- ù FA- ú FB- û FC- ü FD- ý FE- þ FF- ÿ