川

• kanjilicious gen info-ish
• tanoshii gen info
• jp stack ex w/ da deets on the other river kanji
• jisho with the gif
• wiktionary has some hella nice gif too

私

• tanoshii
• jisho
• nihongo ichiban nice gif !!!
• jp stack exchange etymology

note: search more on the history part since others are already given like the onyomi, kunyomi, stroke order, etc