These tables show some Unicode Chinese chars that have caused display problems with some programs. Along with the codes, they are shown here in the HTML &x___; notation, as a bare UTF-8 char, and as a GIF. The GIF files mostly come from unicode.com, though some may have been done via screen capture.
The main problem with Chinese characters is that some programs don't recognize some of the 2E__ codes, which are the "CJK RADICAL" chars.
======== CJK RADICALs ========
Pinyin Code UTF-8 &#x; char <img> DESCRIPTION
___ 2E80 E2 BA 80 CJK RADICAL REPEAT
chang3 2E81 E2 BA 81 CJK RADICAL CLIFF
yin3 2E82 E2 BA 82 CJK RADICAL SECOND #1
yin3 2E83 E2 BA 83 CJK RADICAL SECOND #2
yin3 2E84 E2 BA 84 CJK RADICAL SECOND #3
ren2 2E85 E2 BA 85 CJK RADICAL PERSON
jiong3 2E86 E2 BA 86 CJK RADICAL BOX
ji1 2E87 E2 BA 87 CJK RADICAL TABLE
dao1 2E88 E2 BA 88 CJK RADICAL KNIFE #1
dao1 2E89 E2 BA 89 CJK RADICAL KNIFE #2
xiao3 2E8A E2 BA 8A CJK RADICAL DIVINATION
jie2 2E8B E2 BA 8B CJK RADICAL SEAL
xiao3 2E8C E2 BA 8C CJK RADICAL SMALL #1
xiao3 2E8D E2 BA 8D CJK RADICAL SMALL #2
wang1 2E8E E2 BA 8E CJK RADICAL LAME #1
wang1 2E8F E2 BA 8F CJK RADICAL LAME #2
wang1 2E90 E2 BA 90 CJK RADICAL LAME #3
shou3 2E98 E2 BA 98 CJK RADICAL HAND
ri4 2E9C E2 BA 9C CJK RADICAL 72 SUN
yue4 2E9D E2 BA 9D CJK RADICAL MOON
dai3 2E9E E2 BA 9E CJK RADICAL DEATH
quan3 2EA8 E2 BA A8 CJK RADICAL DOG
mi4 2EAF E2 BA AF CJK RADICAL SILK
mi4 2EB0 E2 BA B0 CJK RADICAL C-SIMPLIFIED SILK
wang3 2EB1 E2 BA B1 CJK RADICAL NET #1
wang3 2EB2 E2 BA B2 CJK RADICAL NET #2
wang3 2EB3 E2 BA B3 CJK RADICAL NET #3
rou4 2EBC E2 BA BC KANGXI RADICAL 130 STANDING MEAT
yu3,4 2ED7 E2 BA A8 CJK RADICAL RAIN
======== KANGXI RADICALs ========
yin3 2F04 E2 BC 84 KANGXI RADICAL 5 SECOND #1
ren2 2F08 E2 BC 88 KANGXI RADICAL 9 PERSON
ji1 2F0F E2 BC 8F KANGXI RADICAL 16 TABLE
dao1 2F11 E2 BC 91 KANGXI RADICAL 18 KNIFE
xiao3 2F29 E2 BC A9 KANGXI RADICAL 42 SMALL
xin1 2F3C E2 BC BC KANGXI RADICAL 116 HEART
shou3 2F3F E2 BD 8A ⼿ ⼿ KANGXI RADICAL 74 HAND
ri4 2F47 E2 BD 87 KANGXI RADICAL 72 SUN
yue4 2F49 E2 BD 89 KANGXI RADICAL 74 MOON
dai3 2F4D E2 BD 8D KANGXI RADICAL 78 DEATH
shui3 2F54 E2 BD 94 KANGXI RADICAL WATER
huo3 2F55 E2 BD 95 KANGXI RADICAL FIRE
quan3 2F5D E2 BD 9D KANGXI RADICAL 94 DOG
wang3 2F79 E2 BD B9 KANGXI RADICAL 122 NET
jin1 2FA6 E2 BE A6 KANGXI RADICAL 176 GOLD
yu3,4 2FAC E2 BE AC KANGXI RADICAL 173 RAIN
======== IDEOGRAPHIC ANNOTATIONs ========
yin3 319A E3 86 9A IDEOGRAPHIC ANNOTATION SECOND MARK
ren2 319F E3 86 9F IDEOGRAPHIC ANNOTATION PERSON MARK
======== CJK UNIFIED IDEOGRAPHs ========
xin1 38FA E3 A3 BA CJK UNIFIED IDEOGRAPH-38FA HEART
zhang4 4E08 E4 B8 88 CJK UNIFIED IDEOGRAPH-4E08 (man, husband)
yin3 4E59 E4 B9 99 CJK UNIFIED IDEOGRAPH-4E59 SECOND #1
yin3 4E5A E4 B9 9A CJK UNIFIED IDEOGRAPH-4E5A SECOND #2
yin3 4E5B E4 B9 9B CJK UNIFIED IDEOGRAPH-4E5B SECOND #3
ren2 4EBA E4 BA BA CJK UNIFIED IDEOGRAPH-4EBA PERSON
ren2 4EBB E4 BB BA CJK UNIFIED IDEOGRAPH-4EBB PERSON
ji1 51E0 E5 87 A0 CJK UNIFIED IDEOGRAPH-51E0 TABLE
dao1 5200 E5 88 80 CJK UNIFIED IDEOGRAPH-5200 KNIFE
dao1 5202 E5 88 82 CJK UNIFIED IDEOGRAPH-5202 KNIFE
xiao3 5C0F E5 B0 8F CJK UNIFIED IDEOGRAPH-5C0F SMALL
xin1 5FC3 E5 BF 83 CJK UNIFIED IDEOGRAPH-5FC3 HEART
xin1 5FC4 E5 BF 84 CJK UNIFIED IDEOGRAPH-5FC4 HEART
shou3 624B E6 89 8B CJK UNIFIED IDEOGRAPH-624B HAND
shou3 624C E6 89 8C CJK UNIFIED IDEOGRAPH-624C HAND
ri4 67E5 E6 97 A5 CJK UNIFIED IDEOGRAPH-67E5 SUN
yue4 6708 E7 8A AC CJK UNIFIED IDEOGRAPH-6708 MOON
dai3 6B79 E6 AD B9 CJK UNIFIED IDEOGRAPH-6B79 DEATH
dai3 6B7A E6 AD BA CJK UNIFIED IDEOGRAPH-6B7A DEATH
shui3 6C34 E6 B0 B4 CJK UNIFIED IDEOGRAPH-6C34 WATER
shui3 6C35 E6 B0 B5 CJK UNIFIED IDEOGRAPH-6C35 WATER
shui3 6C3A E6 B0 BA CJK UNIFIED IDEOGRAPH-6C3A WATER
huo3 706B E7 81 AB CJK UNIFIED IDEOGRAPH-706B FIRE
huo3 706C E7 81 AC CJK UNIFIED IDEOGRAPH-706C FIRE
quan3 72AC E7 8A AC CJK UNIFIED IDEOGRAPH-72AC DOG
quan3 72AD E7 8A AD CJK UNIFIED IDEOGRAPH-72AD DOG
zhi2 76F4 E7 9B B4 CJK UNIFIED IDEOGRAPH-76F4 Vertical
mi3 7CF9 E7 BA 9F CJK UNIFIED IDEOGRAPH-7CF9 SILK
wang3 7DB2 E7 B6 B2 CJK UNIFIED IDEOGRAPH-7DB2 NET
mi3 7E9F E7 BA 9F CJK UNIFIED IDEOGRAPH-7E9F SILK
wang3 7F51 E7 BD 91 CJK UNIFIED IDEOGRAPH-7F51 NET
wang3 7F52 E7 BD 92 CJK UNIFIED IDEOGRAPH-7F52 NET
wang3 7F53 E7 BD 93 CJK UNIFIED IDEOGRAPH-7F53 NET
jin1 91D1 E9 87 91 CJK UNIFIED IDEOGRAPH-91D1 GOLD
jin1 9485 E9 92 85 CJK UNIFIED IDEOGRAPH-9485 GOLD
yu3,4 96E8 E9 9B A8 CJK UNIFIED IDEOGRAPH-96E8 RAIN
======== CJK COMPATIBILITY chars ========
jin1 F90A EF A4 8A CJK COMPATIBILITY IDEOGRAPH-F90A GOLD

Some programs handle only 16-bit Unicode character codes ("plane 0"). The following codes are above 0x0FFFF.
======== 5-digit extension characters ========
Pinyin Code UTF-8 &#x; char <img> DESCRIPTION
___ 2000B F0 A0 80 8B 𠀋 𠀋 CJK UNIFIED IDEOGRAPH-2000B
bao1 2008A F0 A0 82 8A 𠂊 𠂊 CJK UNIFIED IDEOGRAPH-2008A WRAP
slim version of 2F13=⼓ and 52F9=勹 (bao1 "wrap")
ren2 201A2 F0 A0 86 A2 𠆢 𠆢 CJK UNIFIED IDEOGRAPH-201A2 PERSON
ji1 20628 F0 A0 98 A8 𠘨 𠘨 CJK UNIFIED IDEOGRAPH-20628 TABLE
peng3 215D7 F0 A1 97 97 𡗗 𡗗 CJK UNIFIED IDEOGRAPH-215D7 folded hands
??? 226F3 F0 A2 9B B3 𢛳 𢛳 CJK UNIFIED IDEOGRAPH-226F3 ???
wang3 26270 F0 A6 89 B0 𦉰 𦉰 CJK UNIFIED IDEOGRAPH-26270 NET