towa...

yt-live-chat-message-input-renderer #author-name::after {
    content: "Towa...";
    font-size: 13px
}

yt-live-chat-message-input-renderer #author-name {
    font-size: 0;
}

yt-live-chat-message-input-renderer #img {
    display: none;
}

yt-live-chat-message-input-renderer #avatar::after {
    content: "";
    background: url(https://yt3.ggpht.com/meRnxbRUm5yPSwq8Q5QpI5maFApm5QTGQV_LGblQFsoO0yAV4LI-nSZ70GYwMZ_tbfSa_O8MTCU=s32-c-k-c0x00ffffff-no-rj);
    background-size: 24px 24px;
    display: block;
    margin-left: var(--yt-img-margin-left, auto);
    margin-right: var(--yt-img-margin-right, auto);
    max-height: var(--yt-img-max-height, none);
    max-width: var(--yt-img-max-width, 100%);
    border-radius: var(--yt-img-border-radius, none);
    height: 24px;
    width: 24px;
}